2. Bulbophyllum ambrosia (Hance) Schlechter, Repert. Spec. Nov. Regni Veg. Beih. 4: 247. 1919.
芳香石豆兰 fang xiang shi dou lan
Roots below pseudobulbs only. Rhizome 0.8-3 mm in diam., sections between pseudobulbs 3.5-8 cm, bract fibers moderately persistent. Pseudobulbs distant, narrowly ellipsoid or obovoid to cylindric, somewhat flattened or not, 1.8-5 × 0.5-0.9 cm. Petiole 0.3-0.9 cm; leaf blade elliptic, 3-9 × 0.8-2.1 cm, rounded to obtuse. Inflorescence erect to spreading, 3-11 cm, 1-flowered, rarely a subumbellate raceme, 2-flowered; peduncle 1.7-8 cm; bracts 3 or 4, longest 3-10 mm; rachis to 0.5 cm; floral bracts ovate, 2.5-5 × 1.5-4 mm, acute. Flowers resupinate, moderately to widely, and simultaneously opening. Pedicel and ovary 8-18 mm. Dorsal sepal recurved, (ovate or) triangular, 9-14 × 6-9 mm, thin, glabrous, base narrowly attached, margin entire, apex acute to acuminate; lateral sepals free, oblique, elliptic to ovate including a winglike, sometimes antrorse widening along lower margin, or triangular, 10-14 × 7-11 mm, base rather broadly attached, otherwise as dorsal sepal. Petals recurved, triangular with lower margin decurrent along column foot, 5-8 × 2.2-4 mm, thin, glabrous, base broadly attached, margins entire, apex acute to acuminate; lip ± reflexed slightly over 1/2 its length, ± elliptic in general outline, 5.5-8 × 5-6 mm (all without artificial spreading), very thick; abaxially with a weak retuse median ridge toward base, surface glabrous; adaxially concave and with a median slit with slightly thickened margins toward base, convex but deeply furrowed toward tip, surface slightly rugose toward tip, apex rounded to apiculate. Column 1.8-3.2 mm, stigma inside without keels, at its base without teeth, column foot without tooth just above ligament; stelidia deltoid to triangular, 0.3-0.8 mm, acute with a minute tooth along upper margin, close to tip, or minutely bifurcate; anther abaxially ± glabrous and with a low, rounded crest; front margin not drawn out, slightly erose.
Epiphytic or lithophytic in forests, thickets, and on various bedrock types including limestone; 600-1500 m. Fujian, S Guangdong, W Guangxi, Hainan, Yunnan [Nepal, Vietnam].