Dendrobium uliginosum J.J.Sm., Bull. Dép. Agric. Indes Néerl. 39 (1910) 11; Nova Guinea 8, 3 (1911) 572, t. 94D.
Type: Römer, von 4 (holo BO).
Stems (only leafless fragment described) terete, flexuose, 9 mm wide, internodes 1-2 cm long. Inflorescences lateral, racemose, 1.5-2.4 cm long, rachis thick, angular, densely c. 20-flowered. Floral bracts patent, oblong-subovate, 0.6 by 0.38 cm, apex minutely erose, broadly obtuse. Pedicel and ovary 2 cm long. Flowers c. 2.8 cm long. Dorsal sepal obovate-oblong, 1.6 cm by 7 mm; mentum 1.6 cm long, closed apical part c. 0.5 cm long. Petals obliquely spathulate, 1.5 cm by 6.3 mm. Lip clawed, spathulate, 2.25 cm long, when flattened 1.1 cm wide, base for 0.4 cm adnate to the apex of the column-foot, between the claw and the blade with a V-shaped lamella, at apex shortly incurved, with erose margins. Column 0.33 cm long; column-foot 1.58 cm long.
(after Smith, 1911).
Colours: Flower violet-red.
Habitat: Epiphyte in lowland swamp forest.
Flowering time in the wild: September.
Distribution: New Guinea (endemic).
Distribution in New Guinea: Papua (Merauke Regency: Lorentz River).
Notes: Dendrobium uliginosum is related to Dendrobium lawesii, but appears distinct because of the only shortly incurved apex of the lip.
Cultivation: Warm growing epiphyte.