Didymostigma
Didymostigma obtusum (C.B.Clarke) W.T.Wang, type species
Ying T.S. et al., The endemic genera of seed plants in China, Fig. 111 (1993); with permission.
Didymostigma
Full name and orig. publication: Didymostigma W.T.Wang, Acta Phytotax. Sin. 22: 188 (June 1984).
Etymology: From the Greek διδυμος, didymos = double, twin, and στιγμα, stigma = stigma, referring to the distinctly bilobed stigma.
Infrafamilial position: Didymocarpoideae-Trichosporeae-Didymocarpinae (Weber et al. 2013).
Description: Annual caulescent herbs with square-angled stem. Leaves opposite, petiolate, lamina ovate, pubescent at both surfaces, serrulate. Cymes axillary; pedunculate; bracteoles similar to leaves in shape; pedicels pubescent. Sepals free to base, linear-lanceolate. Corolla pale purple, tubular-infundibuliform, limb bilabiate, upper lip 2-lobed, lower lip 3-lobed, lobes rounded. Stamens 2, inserted above middle of corolla tube; filaments slightly curved, linear; anthers ellipsoid, basifixed, apically coherent, locules parallel, not confluent; staminodes 2, linear. Nectary cyathiform. Ovary slender cylindrical, loosely pubescent; style slender; stigma bilobed. Capsule slender cylindrical, puberulous, loculicidally dehiscent.
Chromosome number: Unknown.
Species number: 2.
Species names (given only in case of few species): D. obtusum (C.B.Clarke) W.T.Wang, D. leiophyllum D.Fang & X.H.Lu.
Type species: Didymostigma obtusum (C.B.Clarke) W.T.Wang.
Distribution: SE China (Guangdong, Fujian, Guangxi, Hainan).
Ecology: In forests on rocks and along trails and roadsides in forested areas; 650-1200 m.
Note: A third species, D. trichanthera C.X.Ye & X.G.Shi, was described by Ye & Shi (2005), but reduced to synonymy of Henckelia anachoreta by Yang & al., (2020).
Selected references: Feng & Lu, Acta Phytotax. Sin. 32: 565 (1994), new sp.; Wang et al. in Wu & Raven (eds.), Fl. China 18: 292 (1998); Ye & Shi, Havard Pap. Bot. 9: 447-448 (2005), new sp.; Yang al., PhytoKeys 157: 191-197 (2020), synonymisation of D. trichanthera.
Tax. details, cytology, and bibliography: Gesneriaceae Resource Centre (GRC). Royal Botanic Garden Edinburgh.
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