Discussion
Cylindrolobus gaoligongensis shares the same habitat with the
other two Cylindrolobus species, C. motuoensis andC. glabriflorus , in the northern Gaoligong Mountain, the two
later species were newly described from Motuo, southeastern Xizang and
the border region between China and Myanmar in 2019 (Ya et al. 2019).
All three species have similar slender and terete stems that are
difficult to identify without floral traits. To date, the genusCylindrolobus consists of 9 species in the tropical and
subtropical regions of southwest China (Rao 1997, Chen et al. 2009, Hu
et al. 2010, Liu et al. 2013, Ya et al. 2019). The key to the Chinese
species of Cylindrolobus is provided here.
Key to the Chinese species of Cylindrolobus
1 Stems stout,
clavate………………………………………………………………………….2
– Stems slender,
terete…………………………………………………………………………4
2 Lip
yellow………………………………………………………………………………C.
cristatus
– Lip lateral lobes with purple edges, mid-lobe with lighter purple
edges
and patch
…………………………………………………………………………………………………3
3 Inflorescence glabrous, the lateral lobes bigger than
mid-lobe…..C. clavicaulis
– Inflorescence pubescent, the lateral lobes smaller than
mid-lobe………………..
…………………………………………………………………………………………….C.
marginatus
4 Inflorescence
glabrous…………………………………………………………………………….5
– Inflorescence pubescent
………………………………………………………………………….6
5 lip mid-lobe thickened and papillate on
margin………………………...C. tenuicaulis
– lip mid-lobe not thickened and smoothly on margin
…………………C.
glabriflorus
6 Flowers yellow
…………………………………………………………………………C.
foetidus
– Flowers
white………………………………………………………………………………………….7
7 Lip oblong and front margin
papillate………………………….…C.
motuoensis
– Lip obovate and front margin with long hairs or long glandular
hairs…………..8
8 lip mid-lobe triangular-ovate and apex
mucronate……………C. gaoligongensis
– lip mid-lobe reniform and apex
emarginated………….……..C.