taxonID	type	description	language	source
F4074BCA46EA529FBCA779618FDAE502.taxon	diagnosis	Diagnosis. Leaves narrowly to broadly lanceolate, 5 – 12 × 1 – 12.5 cm, abaxially gray-white appressed tomentulose, margin flat, entire. Phyllaries outer ovate, abaxially sparsely hairy or glabrate.	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
F4074BCA46EA529FBCA779618FDAE502.taxon	distribution	Distribution. Widely distributed in China (Chongqing, Gansu, Guizhou, W Hubei, S Shaanxi, S Sichuan, E and N Xizang, and NW Yunnan), and S and W Himalayan region (Myanmar, India, Bhutan, Nepal, and Kashmir).	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
F471A1F2132E5354A944A061B65D6CDF.taxon	diagnosis	Diagnosis. Leaves elliptic-lanceolate, 2 – 3.5 × 0.5 – 1 cm, abaxially white, appressed tomentose, adaxially glabrous. Phyllaries outer ovate, puberulent or glabrate. This variety is similar to Homostylium argyropholium. It may be intermediate between H. argyropholium and H. polium.	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
F471A1F2132E5354A944A061B65D6CDF.taxon	distribution	Distribution. China, Sichuan (Songpan). Ca. 2400 m.	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
F471A1F2132E5354A944A061B65D6CDF.taxon	etymology	Etymology. The varietal name “ discolor ” is derived from the Latin “ dis - ” meaning “ apart ” or “ opposite ”, and “ - color ” meaning “ color ”. The name likely refers to a color variation (abaxially white leaves) compared to Homostylium albescens var. albescens.	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
B69C68D690AC5FB6B4C8D72FD28BBF02.taxon	diagnosis	Diagnosis. Leaves narrowly to broadly lanceolate, 5 – 12 cm, both surfaces glabrous, sometimes young leaves abaxially sparsely tomentose on midvein only. Phyllaries outer ovate to lanceolate, glabrous. The leaves are similar in shape to those of Homostylium albescens var. albescens, but are often shorter and narrower.	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
B69C68D690AC5FB6B4C8D72FD28BBF02.taxon	distribution	Distribution. China (Chongqing, Gansu, Xizang, Hubei, W Sichuan, N Yunnan). 800 – 3000 m.	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
B69C68D690AC5FB6B4C8D72FD28BBF02.taxon	etymology	Etymology. The varietal name “ glabratum ” is derived from the Latin “ glaber ”, meaning “ smooth ” or “ hairless ”, combined with the neuter suffix “ - atum ”, which indicates “ possession ”. The name likely refers to the abaxially smooth, hairless leaf surface of this variety.	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
A010F55DFBB35490A1547E064C3E5303.taxon	diagnosis	Diagnosis. Leaves ovate or ovate to oblong-lanceolate, 4 – 10 × 1 – 2.5 cm, abaxially brown hairy on veins, densely glandular. It is clearly similar to H. albescens var. salignum but has smaller leaves, more glandular points, and different hairiness.	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
A010F55DFBB35490A1547E064C3E5303.taxon	distribution	Distribution. China, S and E Xizang (Yadong, Bomi, Ranwu, Zayü, etc.), W and SW Sichuan, NW Yunnan (Weixi, Deqin, etc.); India. 1900 to 3900 m.	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
A010F55DFBB35490A1547E064C3E5303.taxon	etymology	Etymology. The varietal name “ glandulosum ” is derived from the Latin “ glandula ”, meaning “ gland ”, and the neuter suffix “ - osum ”, meaning “ full of ” or “ abundant in ”. The name likely refers to the abundant glands on this variety, suggesting glandular leaves on the abaxial surface.	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
676436669FCE562683420C618367C7FB.taxon	diagnosis	Diagnosis. Leaves elliptic-lanceolate, 7 – 20 × 1 – 5 cm, abaxially densely white or gray-white tomentose or cottony, base attenuate, apex acuminate. Phyllaries outer oblong or lanceolate. The tomentose of this variety is the same as that of Homostylium albescens var. limprichtii, but its leaf shape is similar to that of H. albescens var. salignum.	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
676436669FCE562683420C618367C7FB.taxon	distribution	Distribution. China, W Sichuan (Jinchuan, Heishui, etc.), Chongqing (Wushan, Nanchuan, etc.), Guizhou, NW Yunnan (Dali), Gansu, and S Shaanxi.	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
676436669FCE562683420C618367C7FB.taxon	etymology	Etymology. The varietal name “ harrowianum ” is derived from the name of Harrow, with the Latin neuter adjectival suffix “ - ianum ”, indicating possession or association. The variety was likely named in honor of Harrow, either the collector name or the place of collection in London, Britain.	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
A6BD7EB3FD8656F88FEFA84998CD9D2C.taxon	diagnosis	Diagnosis. Leaves elliptic or oblong, 3 – 7 × 1 – 3 cm, abaxially densely white or gray-white tomentose or cottony, base broadly cuneate or rounded. Phyllaries outer ovate, sparsely tomentose. The main differences from the type variety include leaves elliptic or oblong, base broadly cuneate or rounded, apex obtuse, abaxially densely tomentose or cottony, white to gray-white.	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
A6BD7EB3FD8656F88FEFA84998CD9D2C.taxon	distribution	Distribution. China, W and NW Sichuan (Songpan, Maoxian, Lixian, Kangding, Heishui, Hanyuan), Xizang, and W Gansu (Xigu, Longnan). 2400 – 3100 m.	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
A6BD7EB3FD8656F88FEFA84998CD9D2C.taxon	etymology	Etymology. The varietal name “ limprichtii ” is derived from the name of German botanist and teacher Hans Wolfgang Limpricht, with the Latin eponymic suffix “ - ii ”. The variety was likely named in honor of Mr. Limpricht, the collector of the type specimens.	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
0E4BE71CB0305C81A59EF014A1B52A18.taxon	diagnosis	Diagnosis. Stems yellow-brown pilose and white arachnoid. Leaves elliptic or ovate-lanceolate, 10 – 15 × 5 – 7 cm, adaxially arachnoid pilose, reticulate veins prominent, abaxially sparsely pilose, midvein white villous, base rounded or broadly cuneate, margin subentire, apex acute or subrounded. Phyllaries outer ovate, sparsely puberulent. The leaf shape of this variety differs from all other varieties.	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
0E4BE71CB0305C81A59EF014A1B52A18.taxon	distribution	Distribution. China, W Sichuan (Lixian, Maoxian, Wenchuan).	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
0E4BE71CB0305C81A59EF014A1B52A18.taxon	etymology	Etymology. The varietal name “ megaphyllum ” is derived from the Greek “ mega - ”, meaning “ large ” or “ grate ”, and the “ - phyllon ”, meaning “ leaf ”, combined with the Latin neuter suffix “ - um ”. The name likely refers to this variety having larger leaves than other varieties.	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
B209DEA8CBA35A04B82CDC84DCB99299.taxon	diagnosis	Diagnosis. Leaves abaxially densely cottony tomentum.	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
B209DEA8CBA35A04B82CDC84DCB99299.taxon	distribution	Distribution. China, Chongqing, W Sichuan (Emei Mount., Xiaojin), SE Shaanxi (Pingli); N India (Sikkim).	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
B209DEA8CBA35A04B82CDC84DCB99299.taxon	etymology	Etymology. The varietal name “ niveum ” is derived from the Latin “ nix ”, meaning “ snow ”, combined with the neuter suffix “ - eum ”. The name likely refers to its habitat in the snow-covered subalpine and subarctic biome, or to the abaxial leaf densely covered in white tomentum.	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
F3EB54FAF0405059935DA7241D90C911.taxon	diagnosis	Diagnosis. Leaves oblong-lanceolate, 4 – 9 × 1 – 2 cm, abaxially on midvein or totally white pilose, adaxially sparsely hispidulous, flat. Phyllaries outer sparsely hairy. achenes densely pilose. The main differences from type variety include leaves oblong-lanceolate, abaxially sparsely pilose along the midvein or entirely, adaxially sparsely hispid, achenes densely villous.	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
F3EB54FAF0405059935DA7241D90C911.taxon	distribution	Distribution. Common. SW China (W Sichuan, E Xizang, NW Yunnan). 2800 – 4000 m.	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
F3EB54FAF0405059935DA7241D90C911.taxon	etymology	Etymology. The varietal name “ pilosum ” is derived from the Latin “ pilus ”, meaning “ hair ”, combined with the neuter suffix “ - osum ”, meaning “ full of ” or “ abundant in ”. The name likely refers to abundant pilose on the abaxial surface of leaves.	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
AD2A64135AF45B97B9AC1870415955C6.taxon	diagnosis	Diagnosis. Leaves oblong-lanceolate, adaxially hispidulous, reticulate veins prominent, areoles of reticulate veins with foamy process. Leaf shape is similar to that of the previous varieties, but with more prominently raised reticulate venation, making the interveinal areas bullate, adaxially sparsely hispidulous.	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
AD2A64135AF45B97B9AC1870415955C6.taxon	distribution	Distribution. China, NW Yunnan (Dali) and W Sichuan (Huili).	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
AD2A64135AF45B97B9AC1870415955C6.taxon	etymology	Etymology. The varietal name “ rugosum ” is derived from the Latin “ ruga ”, meaning “ wrinkle ” or “ fold ”, combined with the neuter suffix “ - osum ”, meaning “ full of ” or “ abundant in ”. The name likely refers to the uneven leaf surface, indicating the presence of a foamy process on the adaxial surface.	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
8969448869DA59B0B8FDEE10DB92D301.taxon	diagnosis	Diagnosis. Leaves elliptic-lanceolate, abaxially brown pubescent on veins or sometimes totally, glandular, base attenuate, apex acuminate. Phyllaries outer narrowly lanceolate, puberulent. The main differences from the type variety include leaves long-elliptic-lanceolate, base attenuate, apex acuminate, abaxially brown tomentose along veins or entirely, stem often more robust.	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
8969448869DA59B0B8FDEE10DB92D301.taxon	distribution	Distribution. China (W and N Sichuan, Xizang, Yunnan); N India. 1900 to 3900 m.	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
8969448869DA59B0B8FDEE10DB92D301.taxon	etymology	Etymology. The varietal name “ salignum ” is derived from the Latin “ salix ”, meaning “ willow ” and the neuter suffix “ - gnum ”, meaning “ pertaining ” or “ resembling ”. The name likely refers to the resemblance of this variety to willow leaves, particularly in shape.	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
7C265DF38F97589AAAFD194305264C99.taxon	description	Figs 2, 3	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
7C265DF38F97589AAAFD194305264C99.taxon	description	Description. Shrubs, 28 – 194 cm tall. Leaves subpapery, narrowly to broadly lanceolate, ovate, elliptic, or oblong-lanceolate, or elliptic, (2 –) 3 – 17 (– 21) × (0.4 -) 1 – 3 (- 12) cm, midvein and pinnate lateral veins abaxially prominent, veins scabrous or glandular-punctate, sparsely to moderately villosulous; margins entire or teeth mucronulate, upper leaves smaller; adaxially glabrous or scabridulous to scabrous, eglandular or rarely sparsely minutely stipitate glandular; abaxially glabrous or sparsely to densely appressed villosulous to tomentulose, eglandular or sometimes sparsely to densely minutely stipitate glandular. Capitula 6 – 40 (5 – 8 mm wide), in terminal compound corymbiform synflorescences at branch tips. Peduncles slender, 5 – 11 mm long, bracts subulate. Involucres obconic to campanulate, 4 – 7 mm long. Phyllaries 4 – 5 seriate, imbricate, unequal, glabrescent to pubescent or tomentose, outer series narrowly lanceolate, ca. 1 mm long, inner series linear-lanceolate, 3.5 – 4.8 × 0.6 – 0.8 mm.	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
7C265DF38F97589AAAFD194305264C99.taxon	distribution	Distribution. Widely distributed in China (S Gansu, N Guizhou, W Hubei, S Shaanxi, Sichuan, S Xizang, N Yunnan), Himalayas region (Bhutan, N India, Kashmir, and Nepal), N Myanmar, and N Bangladesh (Fig. 3).	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
7C265DF38F97589AAAFD194305264C99.taxon	etymology	Etymology. It is derived from the Latin “ albesco - ” meaning “ to become white ” and the neuter suffix “ - ens ”, indicating a present participle or ongoing action. The specific epithet likely refers to the gradual whitening of tomentose on the abaxial surface of the leaf in this species.	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
7B119ECED66656B3B4154BAC43E32AA5.taxon	diagnosis	Diagnosis. Leaves abaxially densely tomentose or pubescence, secondary veins abaxially not prominent, apex acute or abruptly acute, rarely rounded. Peduncles densely tomentulose. Involucres 4 – 5 mm. Phyllaries 4 - seriate. The leaves exhibit considerable variation, with apices either obtuse or acuminate.	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
7B119ECED66656B3B4154BAC43E32AA5.taxon	distribution	Distribution. Common. China, Sichuan (Damba, Jinchuan, Lixian, Barkham, Xiaojin), and Xizang (Basu).	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
8CD50D5B63D75C11A1D8BF2E08529FFF.taxon	diagnosis	Diagnosis. Leaves abaxially densely white tomentum, secondary veins abaxially not prominent, apex obtuse or rounded. Peduncles densely white tomentum. Involucres 4 – 5 mm. Phyllaries 4 - seriate. The leaves’ coloration could distinctly differentiate it from the other varieties.	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
8CD50D5B63D75C11A1D8BF2E08529FFF.taxon	distribution	Distribution. China, W Sichuan (Jinchuan, Luding, Lixian, Barkam, Maoxian, Yanyuan), and NW Yunnan (Lijiang).	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
8CD50D5B63D75C11A1D8BF2E08529FFF.taxon	etymology	Etymology. The varietal name “ niveum ” is derived from the Latin “ nix ”, meaning “ snow ”, combined with the neuter suffix “ - eum ”. The name likely refers to its abaxial leaf and inflorescence peduncles densely covered in white tomentum.	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
EE14E63990435290A97F920B98854539.taxon	diagnosis	Diagnosis. Leaves abaxially sparsely tomentose, secondary veins abaxially prominent. Involucres 5 – 6 mm. Phyllaries 5 - seriate. The lateral veins of abaxial leaves in this variety are prominently elevated and covered with fine tomentum, differentiating it from the type variety.	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
EE14E63990435290A97F920B98854539.taxon	distribution	Distribution. China, W Sichuan (Barkam, Jinchuan). Jinchuan is a new distribution record at the county level.	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
EE14E63990435290A97F920B98854539.taxon	etymology	Etymology. The varietal name “ paradoxum ” is derived from the Greek “ paradoxos ”, meaning “ contrary to expectation ” or “ unexpected ”, combined with the Latin neuter suffix “ - um ”. The name likely refers to a distinctive or unexpected characteristic that distinguishes this variety from others.	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
14C83666672C55E6B0FEE29CAF1143DA.taxon	description	Figs 4, 5	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
14C83666672C55E6B0FEE29CAF1143DA.taxon	description	Description. Shrubs, 93 – 228 cm tall. Leaves subleathery, alternate, elliptic, oblong, or lanceolate-ovate, 1 – 4 × 0.3 – 1.6 cm; midvein abaxially prominent, lateral veins apparent, pinnate; margin subundulate to entire, revolute, glandular-punctate, upper leaves smaller; adaxially green, moderately scabridulous, minutely glandular, resin-dotted, scabrous; abaxially densely lanate or greyish-white arachnoid-tomentose. Capitula 4 – 10 (- 20), with 15 – 20 ray florets, in corymbiform synflorescences, terminal on axillary branches. Peduncles slender, 2 – 7 mm, bracteoles linear. Involucres campanulate, ca. 5 mm long, 8 mm in diameter. Phyllaries 4 – 5 seriate, imbricate, pubescent to glabrescent, outer phyllaries oblong, 1 × 0.5 mm, inner phyllaries ovate, 4 – 5 × 1 mm.	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
14C83666672C55E6B0FEE29CAF1143DA.taxon	distribution	Distribution. China, S and W Sichuan, SE Xizang, NW Yunnan (Fig. 5).	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
14C83666672C55E6B0FEE29CAF1143DA.taxon	etymology	Etymology. It is derived from the Greek “ argyros ”, meaning “ silver ”, and “ pholis ”, meaning “ skin ” or “ scale ”, combined with the Latin neuter suffix “ - um ”. The specific epithet likely refers to the silvery, scale-like, glandular punctate on the leaves.	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
05EFC1898DE354B3866C34C163F4E040.taxon	description	Figs 6, 7, 8	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
05EFC1898DE354B3866C34C163F4E040.taxon	description	Description. Shrubs, 126 – 192 cm tall. Leaves alternate, ovate, (4 -) 6 – 9 × (2 -) 2.4 – 4.8 cm, venation prominently pinnate, intercostal glossy; margin entire, revolute, abaxially sparsely strigillose, glossy between minor veins, sparsely minutely glandular; adaxially glabrous or glabrate, sparsely minutely glandular, midvein sparsely strigillose. Capitula numerous, in terminal corymbiform synflorescences. Peduncles 1.5 – 2 cm long. Involucres campanulate, 5 – 7 mm in diameter. Phyllaries 3 – 4 seriate, imbricate, 1.5 – 3 × 1 mm, outer series ovate, shorter, inner series ovate, 6 – 7 × 0.5 mm.	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
05EFC1898DE354B3866C34C163F4E040.taxon	distribution	Distribution. China, SE Xizang (Bomê and Nyingchi). 2200 – 3000 m (Fig. 7).	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
05EFC1898DE354B3866C34C163F4E040.taxon	etymology	Etymology. The name “ fulgidulum ” is derived from the Latin “ fulgidus ”, meaning “ shining ” or “ radiant ”, combined with the Latin neuter suffix “ - ulum ”, meaning “ diminutive ”. The specific epithet likely refers to its abaxially glossy intercostal veins on the surface of leaves.	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
070C9BF1806A5C9FAFF297C5A7574B34.taxon	description	Figs 9, 10, 11	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
070C9BF1806A5C9FAFF297C5A7574B34.taxon	description	Description. Dwarf shrubs, cespitose, 12 – 36 cm tall. Leaves alternate, elliptic to oblanceolate, 0.3 – 1.7 × 0.19 – 0.33 cm, leathery, margins entire or (1 -) 2 - serrate-spinose, strongly revolute, adaxially dark green, glabrate, arachnoid, or sparsely sericeous, abaxially densely white tomentose. Capitula 1 – 3, terminal on lateral branches. Peduncles 1.5 – 3 cm long, sparsely strigose, with few subulate bracteoles. Involucres subcampanulate, 4 – 5 mm in diameter. Phyllaries 4 - seriate, imbricate, outer phyllaries extremely short, ovate-lanceolate, inner phyllaries linear-lanceolate, 5 × 0.6 mm, 4 – 5 × as long as outer phyllaries.	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
070C9BF1806A5C9FAFF297C5A7574B34.taxon	distribution	Distribution. Endemic to China, SE Xizang (Lang, Gyaca, Mainling, and Zangbo Valley) (Fig. 10).	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
070C9BF1806A5C9FAFF297C5A7574B34.taxon	etymology	Etymology. The specific epithet “ hypoleucum ” is derived from the Greek “ hypo - ”, meaning “ under ” or “ beneath ”, and “ leucos ”, meaning “ white ”, combined with the Latin neuter suffix “ - um ”. The name likely refers to the whitish coloration on the abaxial surface of the leaves (abaxially densely covered with thick white tomentum) in this species.	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
A4EF9E7605F0511B99A9F59C3EDED6F5.taxon	description	Figs 12, 13, 14	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
A4EF9E7605F0511B99A9F59C3EDED6F5.taxon	description	Description. Shrubs, 48 – 124 cm tall. Leaves subleathery, narrowly linear, 1 – 4 (- 5.4) × 0.1 – 0.3 (- 0.53) cm, margins entire, revolute; midvein prominently glabrous, venation pinnate; adaxially green, rugose, resinous, very sparsely sericeous to nearly glabrous, papillate protrusions; abaxially densely gray-white tomentose; upper leaves smaller. Capitula 6 – 9 mm in diameter, 3 – 6 at ends of lateral branches or numerous in ± densely corymbiform synflorescences, terminal on current-year branches. Peduncles 2 – 6 mm long, with subulate bracteoles. Involucres obconical to campanulate, 5 – 7 × 4 – 7 mm. Phyllaries 4 – 5 - seriate, imbricate, outer phyllaries ovate, ca. 1 mm × 0.5 mm, inner phyllaries longer, linear-lanceolate, sparsely tomentose, 4 – 5 × 0.7 – 0.9 mm.	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
A4EF9E7605F0511B99A9F59C3EDED6F5.taxon	distribution	Distribution. Endemic to China, W Sichuan (Daocheng, Jiulong, Kangding, Muli, Yajiang), and NW Yunnan (Fig. 13).	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
A4EF9E7605F0511B99A9F59C3EDED6F5.taxon	etymology	Etymology. The name “ lavandulifolium ” is derived from the Latin “ lavandula ”, referring to the genus Lavandula L., combined with the neuter suffix “ - folium ”, meaning “ leaf ” or “ have the form of ”. The specific epithet likely refers to the linear leaf shape of this species, resembling the distinctive form of Lavandula.	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
2BD6EC6EC21852459182924B997554CA.taxon	description	Figs 15, 16	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
2BD6EC6EC21852459182924B997554CA.taxon	description	Description. Shrubs, 53 – 166 cm tall. Leaves alternate, subcoriaceous, median leaves oblong-lanceolate to narrowly oblong, (1 -) 3 – 4 (- 6.3) × 0.7 – 1.4 cm, margins entire, revolute, upper leaves gradually smaller, adaxially dark green, prominent venation, glossy, abaxially densely grayish-white to white tomentose except on midvein. Capitula numerous, small, radiate, 2 – 3 mm in diameter, with 4 – 6 ray florets, in densely corymbiform synflorescences, terminal on branch tips or in upper leaf axils. Peduncles slender, densely white tomentum. Involucres cylindrical or subcylindrical, 5.3 – 6.4 × 2 mm. Phyllaries 4 – 5 - seriate, imbricate, subcoriaceous, outer phyllaries very small, ovate, ca. 1 mm long, sparsely pubescent, inner phyllaries oblong-lanceolate, 4.2 – 5.2 × 0.5 – 1 mm.	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
2BD6EC6EC21852459182924B997554CA.taxon	distribution	Distribution. Endemic to China, SE Xizang, Mêdog (Fig. 15).	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
2BD6EC6EC21852459182924B997554CA.taxon	etymology	Etymology. The specific epithet “ motuoense ” is derived from the place name “ Motuo ” combined with the Latin neuter suffix “ - ense ”, meaning “ from ” or “ of ”. The name refers to the species being found and collected in Motuo (Mêdog) County, located in SE Tibet, China.	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
72634C378E1357929AE1FB892FA95A7C.taxon	type_taxon	Type. Homostylium cabulicum (Lindl.) Nees.	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
72634C378E1357929AE1FB892FA95A7C.taxon	description	Description. Perennial shrubs. Stems erect to spreading, profusely branched. Leaves alternate, leathery, subleathery, herbaceous, or chartaceous, basal leaves withering at flowering, middle cauline leaves ovate, lanceolate to linear; margins entire to remotely apiculate, serrulate, or coarsely serrate, revolute or flat; adaxially glabrous or sparsely appressed pubescent; abaxially closely gray- to white-tomentose or sometimes glabrous, sometimes glandular beneath the tomentum with sessile, resinous glands. Capitula pedunculate, solitary or in corymbose or paniculate-corymbose inflorescences at branch tips. Involucres campanulate, cylindrical or obconic, 5 – 9 mm wide (pressed). Phyllaries in 3 – 5 - seriate, imbricate, strongly graduate, keeled, oblong, ovate, ovate-lanceolate to lanceolate, glabrous to nearly glabrous, or sparsely short pubescence, tomentum; margins membranaceous or scarious, sometimes ciliate, abaxially herbaceous or sometimes leathery. Florets heteromorphic, numerous, outer ray florets 1 - seriate, pistillate, white, pink, or violet-blue, lamina 3 - lobed, glabrous, glabrescent, sparsely filiform-pilose or puberulent; central disc florets numerous, bisexual, yellow, tubes glabrous or sparsely to moderately pilosulous basally or apically, limb 5 - lobed, lobes equal or unequal, glabrous or sparsely puberulent, sometimes glandular. Anthers linear, base obtuse, subauriculate, or caudate, apical appendage lanceolate. Styles glabrous or distally papillate; bifid in disc florets, branches linear, abaxially glabrous or sparsely papillate, adaxially two stigmatic lines of densely papillate cells from base to appendages; apical sterile appendages triangular or lanceolate, papillate; filiform in ray florets, not bifid. Receptacles flat or convex to conic, alveolate, sometimes lacerate, epaleate, glabrous. Pappus persistent, white, straw-colored, or reddish-brown, with numerous subequal strigose bristles, outer layer extremely short strigose bristles. Achenes white, straw-colored, tan, or reddish brown, compressed, fusiform, cylindrical, oblong, or obovoid, strigillose, (3 -) 5 – 8 - ribbed, pilose, pubescent, or glandular-pubescent.	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
72634C378E1357929AE1FB892FA95A7C.taxon	distribution	Distribution. 6 of 7 species endemic to SW China. Only Homostylium albescens distributed widely in SW China and the Himalayan region (Nepal, Bhutan, India, Myanmar, Bangladesh, and Kashmir) (Fig. 1).	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
72634C378E1357929AE1FB892FA95A7C.taxon	etymology	Etymology. It is derived from the Greek “ Homo - ”, meaning “ same ”, and “ - styl - ”, meaning “ pillar / style ”, combined with the Latin “ - ium ”, a common neuter genus suffix. The genus name probably refers to the uniform style in the florets of Homostylium species.	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
05EB6FCA38F85B588DD0D48D51AA370E.taxon	description	Figs 17, 18, 19	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
05EB6FCA38F85B588DD0D48D51AA370E.taxon	description	Description. Shrubs, 56 – 118 cm tall. Leaves subleathery, alternate, narrowly ovate to elliptic, 1.3 – 3.7 × 0.4 – 1.6 cm, margin entire, strongly revolute, adaxially green, scabridulous, verrucose-pubescent, abaxially densely white tomentose or arachnoid, including the midrib. Capitula 1.5 cm in diameter, radiate, numerous, 3 – 10 (- 20), in corymbiform synflorescences, terminal on current-year lateral branches. Peduncles slender, 5 – 10 mm long. Involucres campanulate or broadly campanulate, 5 – 6 × 5 – 7 mm. Phyllaries 4 – 5 - seriate, imbricate, outer phyllaries ovate, ca. 1.2 mm long, narrowly lanceolate, inner phyllaries unequal, lanceolate, 3 – 4 × ca. 1 mm.	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
05EB6FCA38F85B588DD0D48D51AA370E.taxon	distribution	Distribution. Endemic to China, Sichuan, Xiaojin (Fig. 18).	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
05EB6FCA38F85B588DD0D48D51AA370E.taxon	etymology	Etymology. The specific epithet “ polium ” is derived from the Greek “ polios ”, meaning “ gray ” or “ hoary ”, combined with the Latin neuter suffix “ - um ”. The name likely refers to the grayish indumentum on the stems or the adaxial leaf surface.	en	Chen, Xinyu, Fu, Zhixi (2025): Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis. PhytoKeys 259: 27-66, DOI: 10.3897/phytokeys.259.155606
