Two new species of Litostigma (Gesneriaceae) from China Vietnam border area based on morphological and molecular data, and modification of stigma character of the genus

Litostigma is a recently described small genus with two species
from limestone karsts from southwestern China. During the course
of field works on the limestone karsts from China Vietnam border area,
two unknown species of Litostigma were collected. Molecular
phylogenetic analyses based on nuclear ITS sequences strongly confirm
the placements of the two new species in Litostigma. Moreover,
these two new species can be distinguished from the known two species
with distinct morphological characters, further supporting their
recognition as new species. With the support of morphological studies and
molecular phylogenetic analyses, Litostigma pingbianense and L.
napoense are recognized as two new species. The stigma character of
Litostigma is modified in this paper, simple or divided stigmas
may occur in this genus.