滇南虎头兰 dian nan hu tou lan

Cymbidium giganteum Wallich ex Lindley var. wilsonii Rolfe ex E. T. Cook, Garden (London, 1871-1927) 65: 158. 27 Feb 1904 ["wilsoni"]; Cyperorchis wilsonii (Rolfe ex E. T. Cook) Schlechter.

Plants epiphytic, autotrophic. Pseudobulbs narrowly ovoid, bilaterally flattened, ca. 6 × 3 cm. Leaves 7, lorate, ca. 90 × 2.5 cm, articulate 6-11 cm from base, apex acute. Inflorescence suberect or arching, 25-70 cm; rachis 5-15-flowered; floral bracts triangular, very small. Flowers slightly fragrant, 9-10 cm in diam.; pedicel and ovary 22-42 mm; sepals and petals green or yellowish green with inconspicuous reddish brown longitudinal venation and more distinct reddish brown speckles along veins; lip cream-yellow with dark reddish brown striations on lateral lobes and with a submarginal V-shaped reddish brown patch composed of dense spots and blotches along apical margin of mid-lobe, becoming purplish red following pollination. Sepals narrowly obovate, 44-57 × 12-19 mm, apex acuminate. Petals narrowly obovate, 40-53 × 7-13 mm, apex acuminate; lip broadly ovate-elliptic, base fused to basal margins of column for 3.5-5 mm, 3-lobed; lateral lobes erect, ciliate; mid-lobe 15-18 mm, margin undulate; disk papillate or puberulent. Column 27-32 mm, broadly winged at apex, sparsely puberulent and papillate near base on ventral surface; pollinia 2, deltoid. Fl. Feb-Apr.

Trees in forests; ca. 2000 m. S Yunnan (Mengzi) [Vietnam].