双叶石豆兰组 shuang ye shi dou lan zu

Rhizome creeping, roots sprouting mainly below pseudobulbs, spreading; new shoots arising from basal node of pseudobulb. Pseudobulbs distinct, apex with 2 leaves. Leaves deciduous, thin. Inflorescence solitary, mostly arising near pseudobulbs, an elongate or somewhat contracted several- to many-flowered raceme. Pedicel with basal node ± coinciding with attachment of subtending bract. Sepals: margins glabrous to ciliate, surface glabrous to hirsute, 3-veined; lateral sepals free (fused along their lower margins in Bulbophyllum cariniflorum and B. triste), ca. as long as dorsal sepal or slightly longer. Petals: margins glabrous, 1-veined; lip: margins without auricles or distinct lateral lobes, margins glabrous to papillose, adaxially glabrous to papillose. Column: stigma protruding at its base or not, foot short; anther: front margin projecting or not, abaxially with or without a low, rounded crest; pollinia 2 or 4, with inner ca. 1/2 as long as outer or shorter, all without appendages.

Nineteen provisionally accepted species: India to Indochina, Thailand, Sumatra; five species in China.