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FOC | Family List | FOC Vol. 25 | Orchidaceae

90. Geodorum Jackson, Bot. Repos. 10: ad t. 626. 1811.

地宝兰属 di bao lan shu

Authors: Xinqi Chen, Phillip J. Cribb & Stephan W. Gale

Cistella Blume; Ortmannia Opiz; Otandra Salisbury.

Herbs, terrestrial, medium-sized, leafy. Pseudobulbs subterranean, cormlike or tuberous, usually globose, few noded, borne on a short rhizome and usually forming clusters, with several thick roots at nodes. Leaves arising from basal node of pseudobulb, several, uppermost largest, contracted into a long petiole-like stalk at base, plicate; petiole-like stalk usually equitant and forming a pseudostem, articulate. Inflorescence arising from basal node of pseudobulb, terminal, racemose; peduncle erect at base, curved through 180° and drooping toward apex; rachis pendulous but becoming erect in fruit, short, usually densely several to many flowered and appearing capitate. Flowers medium-sized or small, not opening widely, not resupinate but, because peduncle pendulous at apex, lip positioned lowermost. Sepals and petals similar though petals usually slightly broader, free, not spreading; lip unlobed or obscurely 3-lobed, base usually saccate, without a distinct spur; disk usually with a callus composed of ridges or wartlike projections. Column short, with a short column foot; anther terminal, 1-locular or incompletely 2-locular, with cap; pollinia 2, usually cleft, waxy, attached to a broad stipe and a large viscidium.

About ten species: from tropical Asia, as far north as S Japan (Ryukyu Islands), to Australia and the SW Pacific islands; six species (two endemic) in China.

1 Inflorescence usually taller than leaves   (2)
+ Inflorescence much shorter than or subequal in height to leaves   (3)
2 (1) Flowers white.   1 G. densiflorum
+ Flowers rose-colored.   6 G. eulophioides
3 (1) Flowers rose-colored; lip 3-lobed.   5 G. esquirolei
+ Flowers white; lip unlobed   (4)
4 (3) Lip with a 2-lobed wartlike callus near base.   4 G. attenuatum
+ Lip with a central callus composed of 2-5 longitudinal fleshy ridges   (5)
5 (4) Leaves well developed at anthesis, (10-)13-21(-31) cm; lip shallowly concave at base; callus on lip composed of 2 or 3 fleshy ridges.   2 G. recurvum
+ Leaves not fully developed at anthesis, 7-11 cm; lip conic-saccate at base; callus on lip composed of 3-5 fleshy ridges.   3 G. pulchellum

Lower Taxa


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