Dendrobium hookerianum Lindley J. Proc. Linn. Soc., Bot. 3: 8. 1858.

金耳石斛 jin er shi hu

Callista hookeriana (Lindley) Kuntze; Dendrobium fimbriatum Hooker var. bimaculosum Tang & F. T. Wang.

Stems pendulous, cylindric, 30-80 cm, 4-7 mm in diam., rigid, unbranched, with many nodes, internodes 2-5 cm, pale yellow when dry. Leaves alternate along entire stem, ovate-lanceolate or oblong, 7-17 × 2-3.5 cm, leathery, base slightly contracted and dilated into sheaths, upper part asymmetric, apex long acute; leaf sheath tightly embracing stem. Inflorescences 1 to several, along distal part of current season’s mature leafy stems, 4-10 cm, laxly 2-7-flowered; peduncle 2.5-5 cm, often spreading outward at 90° angle to stem; basal sheaths 3 or 4, overlapping, lowermost shortest, upper longest; floral bracts ovate-lanceolate, 4-6 mm, apex acute. Pedicel and ovary 3-4 cm. Flowers spreading, thinly textured, golden yellow, disk with a purple blotch on each side. Dorsal sepal elliptic-oblong, 24-35 × 9-16 mm, 7-veined, acute; lateral sepals oblong, 24-35 × 9-16(or more) mm, 7-veined, base oblique, apex subobtuse or acute; mentum conic, ca. 8 mm. Petals oblong, 24-35 × 10-18(or more) mm, 7-veined, margin entire, apex subobtuse; lip suborbicular, 20-30 mm wide, adaxially densely pubescent, base shortly clawed, claw with a callus, margin compound fimbriate. Column ca. 4 mm, upper part enlarged; anther cap conic, glabrous, front margin denticulate.

Lithophytic on rocks in mountain valleys, epiphytic on tree trunks in mountain forests; 1000-2300 m. SE Xizang, W Yunnan [E and NE India].

H. P. Wood (Dendrobiums, 641. 2006) considered Dendrobium hookerianum to be on the borderline between D. sect. Dendrobium and D. sect. Holochrysa.H. P. Wood (Dendrobiums, 641. 2006) considered Dendrobium hookerianum to be on the borderline between D. sect. Dendrobium and D. sect. Holochrysa.