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FOC | Family List | FOC Vol. 25 | Orchidaceae | Platanthera

10. Platanthera yangmeiensis T. P. Lin, J. Phytogeogr. Taxon. 28: 7. 1980.

阴生舌唇兰 yin sheng she chun lan

Platanthera lalashaniana S. S. Ying.

Plants 22-40 cm tall. Rootstock tuberous, fusiform, 2-5 × 0.3-0.5 cm. Stem erect, with a tubular sheath at base, 1- or 2-leaved. Leaves basal or cauline, alternate, elliptic-oblanceolate, 10-15 × 3-5 cm, base clasping, apex obtuse or acute. Peduncle slender, with several scattered, foliaceous, lanceolate bracts; rachis 2-7 cm, laxly 4-8-flowered; floral bracts lanceolate, 8-30 mm. Flowers pale yellowish white to light whitish green; pedicel and ovary arcuate, cylindric, 12-15 mm, slender, glabrous. Dorsal sepal forming a hood with petals, suborbicular, concave, ca. 4.5 × 3.5 mm, glabrous, 3-veined, apex obtuse; lateral sepals reflexed, linear-falcate, ca. 6.5 × 1.8 mm, glabrous, 2-veined, apex acuminate. Petals deltoid, oblique, ca. 5.5 × 1.8 mm, 2-veined, apex acuminate; lip broadly linear, ca. 7 × 1.6 mm, entire, apex obtuse; spur usually spreading horizontally and parallel to ovary, occasionally slightly pendulous and incurved, cylindric, 17-23 mm, slender, gradually tapering toward apex. Column ca. 3 mm; staminodes conspicuous; anther locules nearly parallel; pollinia obovoid, with slender caudicles and suborbicular viscidia; rostellum slightly arched, concave; stigma lobes confluent, flat to slightly concave. Fl. Jun-Aug.

● Shaded humid places in forests; 1000-1700 m. Taiwan.


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