Dendrobium angustiflorum J.J.Sm., Repert. Spec. Nov. Regni Veg. 11 (1912) 132; Nova Guinea 12, 3 (1916) 336, t. 120, fig. 221.
Type: Gjellerup 907 (holo BO).
Stems crowded, fleshy, at the base narrow, terete, upwards thickened, elliptic in cross-section, with few internodes, 9 cm by 12 mm, at apex 1- or 2-leaved. Leaf sheaths at the apex with an obtuse tooth. Leaves lanceolate, 8.5-25 by 2.8-4.3 cm, coriaceous, apex bidentate. Inflorescences laterally from the stems, racemose, 5.5 cm long; peduncle 1.5 cm long, thick, velvety-hairy, rachis ribbed, very densely many-flowered. Floral bracts narrowly triangular, 0.9-1.2 cm long, apex acuminate, pubescent. Pedicel and ovary 1.55-2.1 cm long, densely velvety-hairy. Flowers c. 3 cm long, sepals outside pubescent. Dorsal sepal 2.65 cm by 4.5-'3.75' (4.75?) mm; mentum oblongoid, 0.63-0.75 cm long, obliquely obtuse. Petals 1.8 cm by 2.6-2.7 mm, margins minutely erose-serrulate. Lip 2.35 by 0.66-0.7 cm, base only slightly adnate to the column-foot, with a transverse V-shaped crest, margins minutely erose-fimbriate. Column 0.33 cm long; column-foot 0.63-0.7 cm long.
(after Smith, 1916).
Colours: Flower yellowish white tinged green, lip at base light green.
Habitat: Epiphyte in hill forest on limestone and basalt, and in lowland rainforest. Altitude 20-400 m.
Flowering time in the wild: August, October, December.
Distribution: New Guinea (endemic).
Distribution in New Guinea: Papua (Jayapura Regency).
Notes: Dendrobium angustiflorum belongs in the affinity of Dendrobium capituliflorum, but has much larger flowers.
Cultivation: Warm growing epiphyte.