PhytoKeys 99: 99–106

ABSTRACT

The limestone areas in south China are a major biodiversity hotspot for terrestrial biomes. Hemiboea, with 34 species and 5 varieties, mainly distributed in south China, is one of the characteristic plant groups in limestone areas. Hemiboea suiyangensis, a new species of Gesneriaceae from limestone areas in Guizhou, China, is described and illustrated. The new species is easily distinguished from other Hemiboea species by having an oblique-infundibular corolla with an abaxially gibbous swelling on the upper half of the tube and with a densely villose throat and lower lobes. Hemiboea suiyangensis is similar to H. omeiensis W. T. Wang in the shape of the leaf blade, but differs from the latter by the shape of the petiole, involucre, calyx and corolla and the colour of the corolla. The conservation status of this species is considered to be “Critically Endangered” (CR) according to IUCN Red List Criteria.

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Fig. 1. Primulina cangwuensis (from the holotype). — A: Habit. — B: Opened corolla with stamens and staminodes (pointed out by arrows). — C: Calyx (partly dissected), disc and pistil. — D: Mature fruit.

Fig. 2. Primulina cangwuensis. — A: Habitat. — B1 and B2: Habit. — C: Cyme, illustrating morphological polymerphism of bracts. C1: (a) vertical view of corolla, (b) two bracts, (c) young fruit; C2 and C3: three bracts (C2: adaxial surfaces, C3: abaxial surfaces). — D: Corolla in (D1) lateral view and (D2) frontal view. — E: Calyx lobes and bilobed stigma. — F: Capsule.

Fig. 3. Morphologically similar congeners of Primulina cangwuensis. — A: P. repanda (A1: plant in natural habitat, A2: corolla frontal view). — B: P. subulata (B1: cultivated plant, B2: corolla face view). — C: P. jianghuaensis (C1: plant in natural habitat, C2: corolla face view). — D: P. lobulata (D1: plant in habitat, D2: corolla face view).