No. 2  XUN-LIN YU, MING LI, JIAN-JUN ZHOU & PENG-WEI LI

Petrocodon hunanensis (Gesneriaceae), a new species identified by bothmorphological and molecular evidence from limestone area in Hunan, China

Phytotaxa195(1)：65—72.

ABSTRACT

Petrocodon hunanensis, a new species of Gesneriaceae from limestone area in Hunan Province, China, is described and illustrated. The new species is morphologically similar to Petrocodon coriaceifolius, but readily differs from the latter one in the growth form with terrestrial stems and distinct internodes, both surfaces of leaf densely with white pubescence, petiole densely with reddish-purple or white pubescence, zygomorphic corolla white or pale purple and 2–3 cm long, pedicels 0.3–2 (2.8) cm long, 4 stamens and 1 staminodes, ovary and capsule stipitate. Molecular evidences indicate that it is systematically similar to P. hispidus, but the morphologies of two relatives are obviously different(Cited from Yu et al., 2015).

FIGURE 1. One of eight most parsimonious trees generated from analysis of combined ITS andtrnL-Fdata for all sampled taxa.Bootstrap (BS) values are on the left side of the slash and Bayesian posterior probabilities (PP) on the right. The asterisk indicates no support. The bold indicates the new species, Petrocodon hunanensis X. L. Yu & Ming Li(Cited from Yu et al.,2015).

FIGURE 2. Petrocodon hunanensisX. L. Yu & Ming Li,sp. nov.(Drawn by Jing Tian): (A) plant with flowers, (B) calyx, (C) openedcorolla showing stamens and staminodes, (D) pistil, (E) capsule(Cited from Yu et al.,2015)

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FIGURE 3. Petrocodon hunanensisX. L. Yu & Ming Li,sp. nov.: (a) habitat, (b) and (c) mature plant in the wild, (d) lateral view offlower, (e) opened corolla showing stamens and staminodes, (f) pistil, (g) calyx and disc, (h) seed, (i) young fruit(Cited from Yu et al.,2015).