牛齿兰 niu chi lan

Appendicula bifaria Lindley; A. bifaria var. wallichiana J. D. Hooker; Dendrobium bifarium (Lindley) J. D. Hooker, nom. superfl.; Podochilus cornutus (Blume) Schlechter.

Plants epiphytic or lithophytic. Stems tufted, ascending or pendulous, subterete, 20-50 cm, 2-3 mm in diam., unbranched, internodes ca. 1 cm, completely enclosed in tubular sheaths of leaves. Leaves many, distichous, alternate; blade narrowly ovate-elliptic or suboblong, 25-35 × 6-12 mm, apex unequally 2-lobed or emarginate, often apiculate, tubular-sheathed at base; sheaths persistent, ca. 1 cm, amplexicaul. Inflorescence terminal or lateral, shorter than leaves, usually 1-1.5 cm, 2-6-flowered; floral bracts often reflexed, lanceolate, 4-5 mm. Flowers white, ca. 5 mm in diam.; pedicel and ovary 3-5 mm. Dorsal sepal elliptic, ca. 3.5 × 1.8-2 mm, concave, acuminate; lateral sepals obliquely triangular, 4-5 × 2-2.5 mm; mentum ca. 1 mm. Petals ovate-oblong, 2.5-3 × ca. 1.5 mm; lip suboblong, 3.5-4 × ca. 1.5 mm, slightly contracted near middle, margin crisped, apex obtuse, distal part with a thickened lamellate appendage,with another large appendage near base; basal appendage spreading backward, suborbicular or broadly ligulate, margin incurved. Column ca. 2 mm, foot 2-2.5 mm. Capsule ellipsoid, 5-6 × 2.5-3 mm. Fl. Jul-Aug, fr. Sep-Oct.

Lithophytic on rocks in forests or on humid cliffs; below 800 m. S Guangdong, Hainan [Cambodia, NE India, Indonesia, Malaysia, Myanmar, Philippines, Thailand, Vietnam].