71. Dendrobium crumenatum Swartz, J. Bot. (Schrader). 2: 237. 1799.
木石斛 mu shi hu
Aporum crumenatum (Swartz) Brieger; A. kwashotense (Hayata) Rauschert; Callista crumenata (Swartz) Kuntze; Ceraia parviflora (Ames & C. Schweinfurth) M. A. Clements; Dendrobium crumenatum var. parviflorum Ames & C. Schweinfurth; D. kwashotense Hayata; D. schmidtianum Kraenzlin; Onychium crumenatum (Swartz) Blume.
Stems slightly compressed, cylindric, 40-70 cm, upper part slender, with 3 or 4 internodes dilated and fusiform above base, dilated portion of stem to 2 cm in diam., often with longitudinal ridges. Leaves distichous on middle part of stem, ovate-oblong, ca. 6 × 2.5 cm, leathery, with clasping sheaths at base, apex obtuse and unequally bilobed. Inflorescences arising from distal leafless part of stem, usually solitary; floral bracts elliptic, ca. 6 × 2.5 mm. Pedicel and ovary pale red, ca. 15 mm. Flowers lasting for 1 day, initiated 9 days after a rapid temperature drop, strongly fragrant, spreading; sepals and petals white or sometimes tipped pink, lip white, keels yellow, column and anther cap white. Dorsal sepal ovate-lanceolate, 17-22 × ca. 5 mm, slightly obtuse; lateral sepals obliquely ovate-lanceolate, slightly larger than dorsal sepal; mentum narrowly conic, to 15 mm. Petals obovate-oblong, 17-20 × to 7 mm, subacute; lip 24-25 × 13-18(or more) mm, 3-lobed; lateral lobes erect, subobovate, subtruncate; mid-lobe obovate, ca. 12 × 10 mm, margin crenulate and crisped, mucronate; disk with 5 keeled ridges with denticulate margin. Column ca. 3 mm.
Taiwan (Lu Dao) [Cambodia, India (Andaman Islands), Indonesia, Laos, Malaysia, Myanmar, Philippines, Sri Lanka, Thailand, Vietnam].