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

1. Platanthera stenoglossa Hayata, Icon. Pl. Formosan. 4: 123. 1914.

狭瓣舌唇兰 xia ban she chun lan

Platanthera chingshuishania S. S. Ying; P. iriomotensis Masamune; P. stenosepala Schlechter.

Plants 12-40 cm tall. Rootstock tuberous, fusiform, 2-5 × 0.4-0.7 cm. Stem erect or ascending, with a tubular sheath at base, 1-leaved. Leaf basal, broadly elliptic to ovate-elliptic, 3-15 × 2-6 cm, base clasping, apex acute or obtuse. Peduncle ridged, with 1-3 scattered, small, scalelike (non-foliaceous), lanceolate bracts; rachis 5-15 cm, laxly 5-10-flowered; floral bracts lanceolate to ovate-lanceolate, 6-13 mm, shorter than ovary. Flowers pale yellowish green to green; pedicel and ovary arcuate, fusiform, 8-16 mm. Dorsal sepal not connivent with sepals, ovate, concave, 4-5 × 2-4 mm, glabrous, 1-veined, apex acute; lateral sepals strongly reflexed, linear, 6-7 × 0.8-1.5 mm, glabrous, 1-veined, apex obtuse. Petals erect, spreading, deltoid to ovate-lanceolate, oblique, 4.5-6 × 3-4 mm, 2-veined, apex acute; lip linear-lanceolate, 7-8 × 2-2.5 mm, fleshy, entire, apex obtuse; spur spreading horizontally to slightly pendulous, cylindric, 12-18 mm, slender, apex obtuse. Column 2.5-3 mm; staminodes conspicuous, ellipsoid; anther locules nearly parallel; connective broad, concave; pollinia ovoid, with slender caudicles and orbicular viscidia; rostellum slightly arched, concave; stigma lobes confluent, transversely oblong. Capsule erect, fusiform. Fl. Mar-May.

Broad-leaved forests, forest margins, moist rocks; 300-1600 m. C and N Taiwan [Japan (Ryukyu Islands)].


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