Platanthera linzhiensis, Platanthera deergongensis and their relatives

Lin, Dongliang, Zhang, Liyue, Ye, Chao, Li, Jianwu & Jin, Xiaohua, 2024, Two new species of Platanthera (Orchidaceae, Orchidoideae) from Xizang, China, Phytotaxa 646 (2), pp. 203-212 : 207

Key to Platanthera linzhiensis, Platanthera deergongensis and their relatives .

1- Lateral appendages linear, longer than anther; connective protruding from anther, acute at apex ................................... P. urceolata

1- Lateral appendages not linear, shorter than anther; connective protruding from anther or not, obtuse at apex.................................2

2- Bracts usually longer than flowers; lateral appendages ovate to oblong............................................................................................3

2- Bracts usually shorter than flowers; lateral appendages not ovate to oblong.....................................................................................4

3- Leaves 2–3; sepals about 8-9 mm long; connective protruding from anther ..................................................................... P. contigua

3- Leaf 1; sepals about 5–6 mm long; connective not protruding from anther ............................................................. P. deergongensis

4- Lip yellow-green; spur as long as ovary with pedicel; connective not protruding from the anther; lateral appendages slightly shorter than anther ....................................................................................................................................................................... P. linzhiensis

4- Lip white; spur shorter than ovary with pedicel; connective protruding from anther; lateral appendages about one third of anther.. ....................................................................................................................................................................................... P. opsimantha