4. Geodorum attenuatum Griffith, Calcutta J. Nat. Hist. 5: 358. 1844.
大花地宝兰 da hua di bao lan
Geodorum cochinchinense Gagnepain; G. laoticum Guillaumin; G. regnieri Gagnepain.
Plants 15-30 cm tall. Pseudobulbs tuberous, subellipsoid, 2-3 × 1-1.5 cm. Leaves 3 or 4, well developed at anthesis, oblanceolate-oblong, 9-22 × 2.5-4.2 cm, apex acuminate; petiole-like stalk enclosed in several sheaths and forming a pseudostem 4-9 cm. Inflorescence arising from base of pseudobulb, 6-12 cm, much shorter than leaves; peduncle with 2 or 3 tubular sheaths; rachis pendulous, very short, densely 2-4-flowered; floral bracts lanceolate, 8-12 mm, membranous, apex acute. Flowers not opening widely, white, lip yellow above middle; pedicel and ovary 7-9 mm. Sepals oblong or ovate-oblong, 12-15 × 4-6 mm, apex shortly acuminate or subacute; lateral sepals somewhat oblique. Petals ovate-elliptic, 11-13 × 7-8 mm, apex subacute; lip broadly ovate, 12-14 × ca. 6 mm, concave to shallowly saccate at base, unlobed, lateral margins erect, apex truncate and sometimes emarginate; disk with a brown, 2-lobed wartlike callus near base. Column stout, 2.5-3.5 × ca. 2.5 mm, with a short column foot. Fl. May-Jun.
Forest margins; 200-1400 m. Hainan, S Yunnan [Laos, Myanmar, Thailand, Vietnam].