17. Neottia longicaulis (King & Pantling) Szlachetko, Fragm. Florist. Geobot., suppl. 3: 117. 1995.
毛脉对叶兰 mao mai dui ye lan
Listera longicaulis King & Pantling, J. Asiat. Soc. Bengal, Pt. 2, Nat. Hist. 65: 126. 1896.
Plants autotrophic, 12-15 cm tall. Rhizome with a few filiform roots. Stem 8-10 cm, slender, with 1 sheath at base. Leaves 2, opposite, borne above middle of plant, subsessile, broadly ovate-cordate, ca. 2.5 × 3 cm, base shallowly cordate, apex acute or obtuse. Peduncle ca. 1.5 cm, pubescent, with 1 sterile bract 4-6 mm; rachis 3-4 cm, pubescent, laxly to subdensely 5- or 6-flowered; floral bracts ovate-lanceolate, ca. 3 mm, apex acuminate. Flowers resupinate, yellowish green; pedicel 4-5 mm, almost glabrous; ovary 2-3 mm, glabrous. Dorsal sepal oblong-ovate, ca. 4 × 1.7 mm, 1-veined, apex obtuse; lateral sepals lanceolate, falcate, ca. 4.5 × 1.5 mm, slightly thickened, apex obtuse. Petals linear-lanceolate, ca. 3.5 × 1 mm, 1-veined, apex obtuse; lip suboblong or obovate-oblong, ca. 12 × 7 mm, margin ciliate, apex deeply 2-lobed; lobes nearly parallel or slightly divergent, broadly ovate, ca. 3 mm, apices obtuse; disk glandular papillose-pubescent along lateral veins, midvein thickened. Column arcuate above middle, ca. 2.7 mm; anther inclined toward rostellum; rostellum large. Fl. Jul. 2n = 46.
Pinus wallichiana forests; ca. 2800 m. S Xizang [Bhutan, NE India].
P. Ormerod (pers. comm.) notes that a comparison of type material of this species and Listera yueana (here treated as a synomyn of Neottia pinetorum) led him to find them conspecific, and he believes what is called N. longicaulis here and L. longicaulis in FRPS is in fact a different species (see Ormerod, Taiwania 48: 91. 2003).