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

26. Gastrochilus formosanus (Hayata) Hayata, Icon. Pl. Formosan. 6(Suppl.): 78. 1917.

台湾盆距兰 tai wan pen ju lan

Saccolabium formosanum Hayata, J. Coll. Sci. Imp. Univ. Tokyo 30(1): 336. 1911; Gastrochilus formosanus var. shaoyaoi (S. S. Ying) S. S. Ying; G. nebulosus Fukuyama; G. quercetorum Fukuyama; G. rupestris Fukuyama; S. nebulosum (Fukuyama) S. Y. Hu; S. quercetorum (Fukuyama) S. Y. Hu; S. rupestre (Fukuyama) S. Y. Hu; S. shaoyaoi S. S. Ying.

Stems often prostrate, to 37 cm, ca. 2 mm in diam., slender, often branched, internodes ca. 5 mm. Leaves many, distichous; blade green, sometimes with purple-red spots on both surfaces, oblong or elliptic, 1.5-3 × 0.4-0.8 cm, slightly fleshy, apex acute or bifid, with an abaxial awn. Inflorescence subumbellate, 2- or 3-flowered; peduncle often 1-1.5 cm; floral bracts triangular, 1-2 mm, membranous; pedicel and ovary pale yellow, with purplish red spots, 1-1.5 mm. Flowers yellowish, with purplish speckles or irregular blotches. Dorsal sepal concave, elliptic-oblong, 4.8-7 × 2.5-4 mm, apex obtuse; lateral sepals obliquely oblong, similar in size to dorsal sepal, apex obtuse. Petals oblanceolate, 4-5 × 2.8-3 mm, apex rounded; lip with an epichile and a saccate hypochile; epichile white, broadly triangular or nearly suborbicular, 2.2-3.2 × 7-9 mm, adaxially with a yellow densely papillate-hairy cushion, margin entire or slightly dentate-undulate, apex subtruncate or rounded; hypochile subcupular, ca. 5 mm tall, ca. 4 mm in diam. Column ca. 1.5 mm; anther cap narrowed toward apex. Fl. throughout year.

● On tree trunks in forests; 500-2500 m. N Fujian, W Hubei, S Shaanxi, Taiwan.

Material of this species was treated by T. S. Liu and H. J. Su (Fl. Taiwan 5: 1001. 1978) as Gastrochilus matsuran (Makino) Schlechter, a species restricted to Japan and Korea.


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