日本对叶兰 ri ben dui ye lan

Listera japonica Blume, Coll. Orchid. 115. 1859; Diphryllum japonicum (Blume) Kuntze; L. shaoi S. S. Ying; L. shikokiana Makino; Neottia shaoi (S. S. Ying) Szlachetko; Ophrys japonica (Blume) Makino; O. shikokiana (Makino) Makino.

Plants autotrophic, 10-18 cm tall. Rhizome with very few elongate, filiform roots. Stem 6-8 cm tall, slender, ridged, with 1 or 2 tubular sheaths at base, purple or pale green. Leaves 2, opposite, borne slightly below middle of plant, sessile, ovate-triangular, 1-1.8 × 1-1.6 cm, base cordate or truncate, apex acute. Peduncle 3-5 cm, pubescent; rachis 3-5 cm, pubescent, laxly 3-8-flowered; floral bracts broadly ovate, very small, 1-2 mm, acute. Flowers resupinate, purplish green, lip deep purple; pedicel elongate, 9-12 mm, slender, glabrous or slightly pubescent toward base; ovary 1-3 mm, glabrous; sepals and petals reflexed. Dorsal sepal obovate-elliptic, 1.8-2.5 × 0.8-1 mm, apex acute or obtuse; lateral sepals ovate, oblique, 2-2.5 × 0.7-1.1 mm, apex obtuse. Petals lanceolate or lanceolate-linear, 1.8-2.5 × ca. 0.5 mm, apex obtuse; lip narrowly cuneate, ca. 6 mm, with a pair of auricles at base, apex deeply 2-lobed; lobes diverging at an acute angle, linear, ca. 4 mm, apex obtuse or acute; sinus with a triangular tooth between lobes; auricles strongly incurved, embracing column and overlapping one another above column, slender. Column less than 1 mm. Fl. May-Jul.

Forests; 1400-3000 m. C and N Taiwan [S Japan (Ryukyu Islands)].