Morphological comparison of Platanthera xizangensis and P. milinensis. in Platanthera xizangensis (Orchidaceae, Orchideae), a new species from Southeast Xizang, China

Morphological comparison of Platanthera xizangensis and P. milinensis. TraitsP. xizangensisP. milinensisHabit7–12 cm tall, erectca. 6 cm tall, erectTuberoidsShort, stoloniferousLong, stoloniferousLeafTwo leaves, subopposite; blades lanceolateSolitary; blade ovate to long ovateInflorescenceSubsecund raceme; rachis 3–5 cm long, subdensely 8–10-flowered; floral bracts lanceolateRaceme, densely 5–8-flowered; floral bracts linearLipTriangular ovate, 3-lobed, concave, three calli present near base; lateral lobes basal, incurved with rounded apex; middle lobe ligulate, apex fleshy, obtuseBroadly ovate, slightly 3-lobed; lateral lobes middle in position; lip apex acute.ColumnStigma horizontally straight, without conspicuous lateral lobesStigma semiorbicular西藏舌唇兰（Platanthera xizangensis）与米林舌唇兰（Platanthera milinensis）的形态学比较 性状 西藏舌唇兰 米林舌唇兰 植株形态 株高7–12厘米，直立 株高约6厘米，直立 块茎 短，具匍匐茎 长，具匍匐茎 叶 2枚，近对生；叶片披针形 单生；叶片卵形至长卵形 花序 偏向一侧的总状花序；花序轴长3–5厘米，具8–10朵花，排列略密集；花苞片披针形 总状花序，具5–8朵花，排列密集；花苞片线形 唇瓣 三角状卵形，3裂，凹陷，基部附近具3枚胼胝体；侧裂片位于基部，内弯，先端圆形；中裂片舌形，先端肉质、钝 宽卵形，稍3裂；侧裂片位于中部；唇瓣先端急尖 蕊柱 柱头水平伸直，无明显侧裂片 柱头近半圆形