Gesneriaceae from China before 31 December 2023 (16)

No. 16 Ke Tan , Di-Ya Chen , Xi-Qiang Song, Ming-Xun Ren

A new lithophilous species of Gesneriaceae, Petrocodon rubrostriatus, from the karst area of South Yunnan, China

PhytoKeys 230: 289–299 (2023)

ABSTRACT

A new lithophytic species of Gesneriaceae, Petrocodon rubrostriatus K.Tan, X.Q.Song & M.X.Ren, sp. nov. from Lvchun County, South Yunnan, China, is described and illustrated here. It closest resembles P. mollifolius (W.T.Wang) A.Weber & Mich.Möller, but the new species is differentiated from it by red to brownish-red stripes in the yellow corolla throat and 4.5 mm long bract lobes, a ca. 10 mm long style, and staminodes inserted at 2.5–3 mm from the corolla base. The species is preliminarily assessed as ‘Critically Endangered’ (CR) according to IUCN criteria, since currently only one single locality is known with a few subpopulations on a fragmented limestone cliff, with fewer than 300 individuals.

Original article link: DOI: 10.3897/phytokeys.230.106358

Figure 1. Phylogenetic tree of Petrocodon generated by Maximum Likelihood (ML) of combined trnL-F and ITS datasets. Numbers above the branches indicate ML bootstrap values (≥ 50%).

Figure 2. Petrocodon rubrostriatus K.Tan, X.Q. Song & M.X.Ren, sp. nov. A habitat  B habit  C underside of plant  D oblique side view of flower and buds  E cyme  F bracts and flower bud  G dissected calyx lobes, pistil with opened corolla  H front view of flower  I side view of flower  J stamens with coherent anthers  K dehisced capsule (Photographs by D.C. Meng).

Figure 3. Petrocodon mollifolius (W.T.Wang) A.Weber & Mich.Möller A adaxial view of flower B opened corolla with two fertile stamens and three staminodes C pistil with disc D dissected calyx lobes  E stamens with coherent anthers (Photographs by D.C. Meng).