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FOC | Family List | FOC Vol. 25 | Orchidaceae | Geodorum

1. Geodorum densiflorum (Lamarck) Schlechter, Repert. Spec. Nov. Regni Veg. Beih. 4: 259. 1919.

地宝兰 di bao lan

Limodorum densiflorum Lamarck, Encycl. 3: 516. 1792; Cistella cernua (Willdenow) Blume; Cymbidium pictum R. Brown; Dendrobium nutans C. Presl; Geodorum formosanum Rolfe; G. fucatum Lindley; G. nutans (C. Presl) Ames; G. pacificum Rolfe; G. pictum (R. Brown) Lindley; G. purpureum R. Brown; G. semicristatum Lindley; Malaxis cernua Willdenow; Ortmannia cernua (Willdenow) Opiz; Otandra cernua (Willdenow) Salisbury; Tropidia grandis Hance.

Plants 30-50 cm tall. Pseudobulbs tuberous, irregularly ellipsoid to triangular-ovoid, borne on a very short rhizome and forming dense clusters, 1.5-2 cm in diam., few noded, usually partially covered in fibrous sheaths. Leaves 2 or 3, well developed at anthesis, lustrous, elliptic, narrowly elliptic, or oblong-lanceolate, 15-35 × (2-)3-9 cm, papery, apex acuminate or acute; petiole-like stalk enclosed in several sheaths and forming a pseudostem to ca. 25 cm. Inflorescence (10-)30-40 cm, usually as tall as or taller than leaves; peduncle with 3-5 widely spaced sheaths; sheaths tubular, 4-6.5 cm, membranous; rachis pendulous, 2.5-6 cm, densely (2-)5-15-flowered; floral bracts linear-lanceolate, 5-9 × ca. 2.5 mm, apex acute to acuminate. Flowers not opening widely, white to pinkish, lip with a central yellow callus and crimson-purple venation and streaks; pedicel and ovary 7-8 mm. Sepals oblong, 10-12 × 3-4 mm, apex acute; lateral sepals somewhat oblique. Petals subobovate-oblong, 10-12 × 4-5 mm, apex acute or mucronate; lip broadly ovate-oblong, 10-11 × 9-10 mm, shallowly saccate at base, unlobed, lateral margins erect, apex subtruncate and slightly emarginate or retuse; disk with a central callus composed of a cluster of irregular, fleshy wartlike projections or a pair of short, fleshy longitudinal ridges. Column 3-5 mm, with a short column foot. Capsule oblong, 3.5-5 × ca. 1.5 cm. Fl. Jun-Jul. 2n = 36, 52, 54.

Forests, streamsides, grassy slopes; 300-2400 m. Guangdong, Guangxi, Guizhou, Hainan, SW Sichuan, Taiwan, Yunnan [Cambodia, India, Indonesia, Japan (Ryukyu Islands), Laos, Malaysia, Myanmar, New Guinea, Sri Lanka, Thailand, Vietnam; Australia].

The recent use of the name Geodorum terrestre (Linnaeus) Garay for this species (see Garay, Harvard Pap. Bot. 291: 47. 1997) cannot be justified. The specimen referred to by Garay as the type is G. citrinum Jackson, rather than G. densiflorum (P. Ormerod, pers. comm.).


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