taxonID	type	description	language	source
5EBD5E6BA64E5F92B03539D4BD564BC4.taxon	description	Figs 1, 2, 3 a – e	en	Xu, Si-Cheng, Xiao, Jin-Fei, Xiang, Chun-Lei, Li, Bo (2025): Unveiling the hidden diversity: the second species of Wenchengia (Lamiaceae) discovered from a dry mountaintop meadow of Hainan Island, China. PhytoKeys 259: 239-247, DOI: 10.3897/phytokeys.259.155679
5EBD5E6BA64E5F92B03539D4BD564BC4.taxon	diagnosis	Diagnosis. This species differs from W. alternifolia by its opposite phyllotaxy (vs. alternate), leaves blade oblong-ovate with round to slightly truncate bases (vs. oblanceolate to lanceolate with cuneate-decurrent bases), calyces shallowly funnelform with spreading lips (vs. funnelform with straight lips), upper lip of calyx intermediately 3 - lobed and the lobes ovate with acuminate apices (vs. shallowly 3 - toothed and the teeth acutely deltoid), lower lip of calyx trapeziform with obliquely deltoid lobes and acute apices (vs. rectangular with rounded lobes and small tines), and nutlets longitudinally 8 - ribbed (vs. 5 - ribbed).	en	Xu, Si-Cheng, Xiao, Jin-Fei, Xiang, Chun-Lei, Li, Bo (2025): Unveiling the hidden diversity: the second species of Wenchengia (Lamiaceae) discovered from a dry mountaintop meadow of Hainan Island, China. PhytoKeys 259: 239-247, DOI: 10.3897/phytokeys.259.155679
5EBD5E6BA64E5F92B03539D4BD564BC4.taxon	description	Description. Subshrubs, 15 – 30 cm tall, bare at base and leafy above; young stems and the petioles, lower leaf surface, and margins of young leaves purple and hirtellous. Stems woody, flexible, prostrate or ascending, branched near base, bending into inflorescences. Leaves opposite; lamina chartaceous, oblong-ovate, 2.0 – 7.5 cm long, 2.0 – 2.7 cm wide, apex obtuse, base round or slightly truncate, margin shallowly crenate-serrate; adaxially dark green, abaxially greenish-white, primary vein convex below and slightly concave above, lateral veins 4 – 6 pairs; petioles 1.0 – 2.0 cm long. Inflorescence raceme-like, 7.0 – 17.5 cm long, solitary, terminal, flowers spirally arranged in bud, subsequently twisting and facing the same direction during anthesis; bracts purple, linear-lanceolate, 3.5 – 7.5 mm long, hirtellous; bracteoles caducous. Calyx green to purple, shallowly funnelform, 6.0 – 8.0 mm long, hirtellous outside, conspicuously veined; 2 - lipped, lips spreading; upper lip intermediately 3 - lobed, lobes equal, ovate, ca. 3.0 mm long, apex acuminate; lower lip trapeziform, 2 - lobed, lobes dilated and coalescent, obliquely deltoid, ca. 6.0 mm long, apex acute. Corolla pink, tubular-campanulate, 2.8 – 3.7 cm long, gradually dilated into a broad throat; tube straight, 2.3 – 2.7 cm long, sparsely puberulent outside, bearded at lower middle inside; 2 - lipped; upper lip 2 - lobed, lobes subequal, ± round, 5.0 – 6.0 mm wide; lower lip 3 - lobed, middle lobe largest, subelliptic, ca. 1 cm wide, finely crenate at margin. Stamens 4, posterior pair longer, slightly exserted from corolla tube; filaments arcuate, with capitate glandular hairs; anthers ovoid, glabrous, 2 - celled, thecae divaricate. Style longer than stamens, unequally 2 - clefted at apex, lobes subulate. Ovary terete, shallowly lobed, puberulent and glandular at apex, disc poorly developed. Nutlets 4, broadly obovoid, ca. 1.5 mm long, ca. 1.5 mm wide, connected to the receptacle by slender stalks; apically tuberculate and pubescent, longitudinally 8 - ribbed, areole ca. 0.30 times as long as the nutlet.	en	Xu, Si-Cheng, Xiao, Jin-Fei, Xiang, Chun-Lei, Li, Bo (2025): Unveiling the hidden diversity: the second species of Wenchengia (Lamiaceae) discovered from a dry mountaintop meadow of Hainan Island, China. PhytoKeys 259: 239-247, DOI: 10.3897/phytokeys.259.155679
5EBD5E6BA64E5F92B03539D4BD564BC4.taxon	etymology	Etymology. The specific epithet “ Wui ” is dedicated to Chengyi Wu for his tremendous contributions to the taxonomy of Lamiaceae in China, who also described and named the genus Wenchengia in honor of his teacher Wencheng Wu.	en	Xu, Si-Cheng, Xiao, Jin-Fei, Xiang, Chun-Lei, Li, Bo (2025): Unveiling the hidden diversity: the second species of Wenchengia (Lamiaceae) discovered from a dry mountaintop meadow of Hainan Island, China. PhytoKeys 259: 239-247, DOI: 10.3897/phytokeys.259.155679
5EBD5E6BA64E5F92B03539D4BD564BC4.taxon	distribution	Distribution and habitat. Currently, W. wui is only known from its type locality in Tianya District, Sanya City, in southern Hainan Province, China. It inhabits a dry mountaintop meadow, at an altitude of 680 – 740 m (Figs 1 A, 3 a). The place is surrounded by lowland rainforest and has a distinctive microclimate. It contains large, exposed rocks with sparse soil, where precipitation is abundant but poorly retained. The vegetation is predominantly ferns and interspersed with low herbs and shrubs.	en	Xu, Si-Cheng, Xiao, Jin-Fei, Xiang, Chun-Lei, Li, Bo (2025): Unveiling the hidden diversity: the second species of Wenchengia (Lamiaceae) discovered from a dry mountaintop meadow of Hainan Island, China. PhytoKeys 259: 239-247, DOI: 10.3897/phytokeys.259.155679
