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

1. Polystachya concreta (Jacquin) Garay & H. R. Sweet, Orquideologia. 9(3): 206. 1974.

多穗兰 duo sui lan

Epidendrum concretum Jacquin, Enum. Syst. Pl. 30. 1760; Dendrorkis purpurea (Wight) Kuntze; Onychium flavescens Blume; Polystachya flavescens (Blume) J. J. Smith; P. pleistantha Kraenzlin; P. purpurea Wight; P. purpurea var. lutescens Gagnepain.

Plants 10-29 cm tall. Pseudobulbs usually slightly compressed, ovoid to conic, 1-2 × 0.5-1.5 cm, with 2 or 3 nodes. Leaves 3-5, narrowly oblong or narrowly ovate-lanceolate, 7-18 × 1.2-3.4 cm, base narrowed into a petiole and then decurrent into a sheath, apex obtuse or unequally shallowly 2-lobed. Inflorescence terminal, 3-10 cm, usually 1-4-branched; rachis ± narrowly winged, racemose, branches 1-2 cm, 3-8-flowered; floral bracts narrowly lanceolate to nearly subulate, 2-5 mm. Flowers pale yellow, small; pedicel and ovary 8-12 mm. Dorsal sepal subovate, 3.5-4 × 1.5-2 mm, obtuse; lateral sepals broadly ovate-triangular, ca. 4 mm wide at base. Petals linear-oblanceolate or subcuneate, 2.5-3 × ca. 0.5 mm; lip 3.5-4 mm, base contracted into a short claw, 3-lobed; lateral lobes incurved, ovate-oblong to narrowly oblong, small; mid-lobe orbicular, margin undulate and irregularly erose, apex emarginate, with a thickened central part. Column ca. 1 mm, foot short. Capsule ellipsoid, 1.2-1.4 cm × 5-6 mm. Fl. and fr. Aug-Sep.

Epiphytic on trees in dense forests or thickets; 600-1500 m. S Yunnan [Cambodia, India (including Nicobar Islands), Indonesia, Laos, Malaysia, Philippines, Sri Lanka, Thailand, Vietnam; Africa, subtropical and tropical America].


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