New Taxa
The newest published taxa and newest record of Gesneriaceae from China before 31 December 2019 (15)



Petrocosmea weiyigangii (Gesneriaceae), a new species from a limestone cave in southern China

 Gardens’ Bulletin Singapore 71 (1): 175–183



A new species, Petrocosmea weiyigangii F.Wen (Gesneriaceae), is described from southern China. It differs from all other species of Petrocosmea in its deeply lobed leaf blades. It is only known from a limestone cave in northwestern Guangxi, China. Following the IUCN Red List categories and criteria, Petrocosmea weiyigangii is assessed as Critically Endangered.

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 Fig. 1. The similar leaf morphology of A. Petrocosmea weiyigangii F.Wen. and B. Primulina multifida B.Pan & K.F.Chung. (Photos: F. Wen).





Fig. 2. Petrocosmea weiyigangii F.Wen. A. Habitat. B-1. Habit, with author’s finger for scale. B-2. Relative size of the adult plant with author’s hand for scale. C. Colony of flowering plants. D. Corolla viewed from the front. (Photos: F. Wen).





 Fig. 3. Petrocosmea weiyigangii F.Wen. A. A variety of leaves. B. Flower viewed from the top. C. Abaxial surfaces of calyx lobes. D. Calyx lobes, adaxial surfaces. E. Corolla , opened up to show stamens and staminodes. F. Pistil (Style, ovary and disc). G. Stamens with glabrous anthers and white pilose filaments. H. Mature dehisced capsule. (Photos: F. Wen).



Fig. 4. Petrocosmea martinii (H.Lév.) H.Lév. A. Habitat. B. Habit, with author’s finger for scale. C. Plant in flower. D. Corolla viewed from the front. (Photos: F. Wen).


Fig. 5. Distribution of Petrocosmea weiyigangii F. Wen (), marked as ‘B’, and its relative, P. martini (H.Lév.) H.Lév. (in the elliptical area, marked as ‘A’) in China.