注：名称已修订，正名是：戟唇石豆兰 Bulbophyllum depressum

Bulbophyllum depressum King & Pantling J. Asiat. Soc. Bengal, Pt. 2, Nat. Hist. 66: 585. 1897.

戟唇石豆兰 ji chun shi dou lan

Bulbophyllum hastatum Tang & F. T. Wang.

Rhizome creeping, slender, ca. 1 mm in diam., branched, with 2 or 3 roots at base of pseudobulbs. Pseudobulbs 8-14 mm apart on rhizome, prostrate on rhizome, apical half ascending, obliquely ovoid, small, 4-8 mm, 2.5-4 mm in diam., with a terminal leaf. Petiole 1-2 mm; leaf blade ovate or ovate-lanceolate, 6-15(-23) × 4-8(-10) mm, papery, apex apiculate. Scape from base of pseudobulb or node of rhizome, erect, filiform, ca. 6 mm, 0.3-0.4 mm in diam., terminating in a solitary flower, with 1 membranous sheath at base; floral bracts cupular, shorter than pedicel and ovary, membranous. Pedicel and ovary ca. 1 mm. Flowers very small, erect, purple, with greenish base and apex. Dorsal sepal lanceolate, ca. 3 × 0.7 mm, apex acute-acuminate; lateral sepals falcate-lanceolate, slightly longer than dorsal sepal, ca. 0.7 mm, base adnate to column foot forming a mentum, apex acuminate. Petals elliptic, ca. 2 × 0.5 mm, apex acute; lip subovate in outline, ca. 1.5 mm, glabrous, 3-lobed; lateral lobes erect, suborbicular, their apices ca. 1 mm apart when spreading out, membranous; mid-lobe ligulate, fleshy-thickened, ca. 0.7 mm, apex obtuse; disk with 1 callus running to mid-lobe. Column ca. 1 mm; foot ca. 1.5 mm, without free part; stelidia inconspicuous; anther cap subglobose, glabrous. Fl. Jun-Nov.

Tree trunks in dense forests or rocks along valleys; 400-600 m. SW Guangdong, Hainan, SE Yunnan [India, Thailand].