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