作 者 ：Pan Kai-Yu
期 刊 ：植物分类学报 1987年 4期
Keywords:Gesneriaceae, Oreocharis, Taxonomy, Distribution, Palynology, Seed coat, Ultramicrostructure,
Abstract:
The genus Oreocharis as circumscribed here consists of 27 species including 5
varieties, of which 5 species and 4 varieties are described as new in the present paper. In the
work analysed were the external morphology and geographic distribution and examined under
SEM were pollen exine of 22 species and seed coat of 16 species. As a result, three types of the
corolla, two types of the anther, three types of the pollen exine and three types of the seed
coat are distinguished here in the paper. It is discovered that the corolla in the genus is relati-
vely stable, though diverse, and highly correlated with the characters of pollen grains and
seeds. The corolla clearly bilabiate but constricted at the throat, occurring in O. auricula, O.
cordatula, O. aurantiaca, etc., for an example, is correlated with smooth, reticulate pollen exine
and partial tectum and the reticulate and smooth seed coat. For this reason the subdivision of
the genus in the paper is mainly based on the characters of the corolla, but combined with those
of the anther, pollen and seed coat. The genus is divided into four sections in the present clas-
sification. Dasydesmus Craib, based on a single species. O. bodinieri, is reduced here, and the
reasons are given. The genus is distributed mainly in the subtropics, and less frequently in the
tropics, of China south of 32.5°N and east of 98.5°E, with only two species beyond the border,
O. hirsuta in Thailand (only a single locality in Chiengmai) and O. aurea also found in north
Vietnam (see Fig. 1, Table 3).
Sect. 1. Stomactin (Clarke) Fritsch. Corolla urceolate-tubular, constricted at the throat,
with limb distinctly bilabiate; anthers broad-oblong; seed coat reticulate, smooth, rarely minu-
tely tuberculate; pollen exine fine-reticulate, tectum partial and smooth, luminae slightly unequ-
al in size.
Sect. 2. Orthanthera K. Y. Pan Corolla campanulate or campanulate-tubular; anthers bro-
ad-oblong; seed coat reticulate, muri smooth, rarely spiny-processed; pollen exine fine-reticulate,
with partial and smooth tectum and luminae slightly unequal in size, rarely exine insular and
fine-tuberculate, tectum perforate.
Setc. 3. Oreocharis Corolla thin-tubular; anthers broad-oblong; seed coat densely spiny-
processed, rarely fine-tuberculate; pollen exine insular, densely spiny-processed, rarely fine-
reticulate and smooth, luminae unequal in size.
Sect. 4. Platyanthera K. Y. Pan Corolla campanulate; anthers hippocrepiform; seed coat
densely spiny-processed; pollen exine fine-reticulate, tectum perforate, luminae small, nearly
equal in size.
In the section Stomactin, although the constriction of corolla at its throat is a specialized
character, the characters of seed coat, pollen grains and anthers are apparently primitive. The-
refore it may be said at least that more primitive characters are preserved in the section. In the
section Oreocharis, on the contrary, the characters of corolla, seed coat and pollen exine are all
advanced. And in the section Platyanthera, the seed coat, pollen (with perforate tectum) and
anthers have developed rather specialized characters.