Dysosma villosa Z.W.Wang & H.C.Xi, 2019

Wang, Zhiwei, Sun, Wenguang, Xi, Houcheng & Chang, Shuai, 2019, Dysosma villosa (Berberidaceae), a new species from Guizhou, Southwestern China, PhytoKeys 124, pp. 77-85 : 78-79

Dysosma villosa Z.W.Wang & H.C.Xi sp. nov. Figures 1 , 2 , 3

Diagnosis.

Dysosma villosa is most similar to D. difformis (Hemsl. & E.H.Wilson) T.H.Wang ex T.S.Ying, but differs from the latter by its inflorescences generally with more flowers (5-13 vs. 2-5), white-villous petioles, stems and abaxial leaf blade and dark purple-red stigma.

Type.

CHINA. Guizhou: Congjiang County, Guanghui Town, Jiaya Village, Yueliang Mountains, alt. 1105 m, 25.636N, 108.293E, 09 May 2015, Z.W. Wang & H.C. Xi WAZW15016 (holotype: CSH barcode CSH0160399!; isotype: KUN!).

Description.

Herbs 9-23 cm tall. Rhizomes usually terete, slender, with numerous fibrous roots. Stems erect, branched, pale green, white-villous. Leaves alternate, obliquely peltate; petioles 6-12 cm long, white-villous; blades 9-17 × 13-23 cm, papery, abaxially pale green, densely white-villous, adaxially deep green, glabrous, base not deeply divided or undivided, margin sparsely denticulate. Umbels 5-13-flowered, sessile, emerging near the base of the leaf blade. Flowers pendulous, pedicels 1.6-2.2 cm long, apically gibbous, sparsely white-villous; sepals 1.4-2.2 cm × 1-4 mm, oblong-lanceolate, pale green, abaxially pubescent, adaxially glabrous, apex acuminate; petals 4-5 × 1.2-1.6 cm, oblong-loriform, dark purple-red, glabrous, apex round; stamens 6, filaments flat, ca. 0.9 cm long, dark purple-red, anthers ca. 1.4 cm long, falcate, connectives exceeding the anther sacs in measurements, anther sacs, ca. 0.9 cm, dark purple, pollen yellow; ovary obpyriform, green, ca. 0.9 cm, style ca. 2 mm long, green, densely speckled with red or purple, stigma multilobate (crown-shaped), dark purple-red. Berry globose, 1.5-2.4 cm long. Seeds numerous, lacking an aril.

Distribution and habitat.

This new species is currently known from Yueliang mountains of Congjiang County, Guizhou Province, Southwestern China. It grows under forests, at an elevation between 800 and 1500 m.

Phenology.

This new species has been observed flowering from April to June and fruiting from June to September.

Etymology.

The specific epithet is derived from the character (white-villous petioles, stems and abaxial leaf blade) of this species.

Additional specimen examined.

CHINA. Guizhou: Congjiang County, Guanghui Town, Baiji Village, alt. 823 m, 25.633N, 108.291E, 20 April 2016, Z.W. Wang & H.C. Xi WAZW16029 (KUN); Congjiang County, Guanghui Town, Changniu Village, alt. 936 m, 25.596N, 108.271E, 20 April 2016, Z.W. Wang & H.C. Xi WAZW16032 (CSH); Ronjiang County, Jihua Town, Baiwang Village, alt. 806 m, 25.657N, 108.269E, 18 May 2017, Z.W. Wang & H.C. Xi WAZW17024 (KUN).

Figures

Figure 1. Holotype of Dysosma villosa Z. W. Wang & H. C. Xi.

Figure 2. Images of living plants of Dysosma villosa Z. W. Wang & H. C. Xi. A Plant B petiole and stem C abaxial leaf blade D inflorescence E flower F anatomy of flower.

Figure 3. Dysosma villosa Z. W. Wang & H. C. Xi. A Plant (aerial part) B root C flower D sepal E stamen F pistil.