细柄石豆兰 xi bing shi dou lan

Dendrobium striatum Griffith, Not. Pl. Asiat. 3: 318. 1851; Sarcopodium striatum (Griffith) Lindley.

Roots along entire rhizome. Rhizome 1-4 mm in diam., sections between pseudobulbs 1.5-10 cm, bract fibers hardly persistent. Pseudobulbs distant, globose to ovoid, 0.8-1.7 × 0.7-1.7 cm. Petiole 1.2-5.5 cm; leaf blade ovate to elliptic, 2.3-8 × 1.2-3.8 cm, obtuse. Inflorescence erect to spreading, 2.5-15 cm, 1-flowered or a (subumbellate) raceme, 2-4-flowered; peduncle 1.7-13 cm; bracts 4-6, longest 4.5-9.5 mm; rachis to 1.6 cm; floral bracts ovate, 4-7 × ca. 2 mm, acute. Flowers resupinate, fully opening ± simultaneously, light greenish or yellowish green, veins purple, lip whitish green or yellow with purple lines; pedicel and ovary 10-17 mm. Dorsal sepal recurved, elliptic to ovate, 9-12 × 3.3-4.5 mm, thin, glabrous, base rather narrowly attached, margins entire, apex acute; lateral sepals free, oblique, triangular, 8.5-13.5 × 3.5-5 mm, base rather broadly attached, otherwise as dorsal sepal. Petals recurved, elliptic to ovate-triangular, 4.5-7 × 1.8-2.4 mm, thin, glabrous, base rather narrowly attached, margins entire or slightly erose toward tip, apex acute to acuminate; lip recurved at ca. 1/3 of its length, ovate, 5-8 × 2.2-4 mm (all without artificial spreading), rather thin, glabrous, abaxially with a narrow, retuse median ridge over ca. 2/3 of length of lip, adaxially slightly concave and with 2 short, rather inconspicuous, parallel, rounded ridges near base, flat or slightly convex toward tip, margins entire and with 2 minute, antrorse, triangular, acute auricles near base, apex emarginate to rounded. Column 2.8-3.5 mm, stigma inside without keels, its basal margin protruding, column foot without tooth; stelidia rounded to ± truncate, ca. 0.7 mm, front margin somewhat erose, acute; anther abaxially glabrous, with a high, conic crest near tip, front margin not drawn out, erose. Fl. Jan-Feb, Oct-Dec.

Rocks in thickets on limestone slopes, epiphytic in forests; 1000-2300 m. SE Yunnan [Bhutan, India, Nepal, Thailand, N Vietnam].