Ambrella longituba H.Perrier, Bull. Soc. Bot. France 81: 655 (1934).
Plants acaulis, 10 cm. tall, with 5-6 flat, elliptical or ovate, oblong leaves (5-9 x 1.6-2.8 cm), sharply contracted basally, obtuse and unequally bilobed apically. Inflorescence equaling the leaves; peduncle with 2 distinct articulations; sheaths very few, scarious-brownish bracts wide scarious, apiculate, 6 mm long; flowers green, 4.5 cm long. Sepals and petals similar, lanceolate-acute (4 cm x 6 mm). Labellum 4.5 cm long, median lobe widely obovate (1.8 x 1.3 cm), apiculate lateral lobes obtuse, from 4-6 mm. basally; spur oriface 6-7 mm wide, attenuate below, cylindrical. 3.5 cm long. Anther wider (4 mm ) than long (2 mm), slightly swollen, provided with a narrow, 4-toothed lip frontally; pollina spherical ((1 mm ); cauda fusiform, 2.5 mm long by 8 mm wide, inserted to their middle into the anther cap. Column 5 mm long, entirely hidden by the labellum; auricles sub rectangular (3.5 x 2.5 mm) tongue of the rostellum thick, 4 mm long and l mm wide. Pedicel very short (9-10 mm).
Epiphytes of trees, in Calliandra alternans, from 800 m alt., flowering November.
N. Madagascar