Leioanthum bifalce (Lindl.) M.A.Clem. & D.L.Jones, Orchadian 13(11): 490 (2002).
Dendrobium bifalce Lindl., London J. Bot. 2: 237 (1843); Doritis bifalcis (Lindl.) Rchb.f., Xenia Orchid 2: 7 (1874); Callista bifalcis (Lindl.) Kuntze, Revis. gen. pl. 2: 654 (1891); Sayeria bifalcis (Lindl.) Rauschert, Feddes Repert. 94(7-8): 466 (1983). Type: New Guinea, Hind s.n. (holo K-LINDL).
Dendrobium breviracemosum F.M.Bailey, Queensland Agric. J. 3: 158-9 (1898). Type: Douglas Harbour, New Guinea, May 1898, F.M. Bailey 17 (holo BRI; iso K).
Dendrobium chloropterum var. striatum J.J.Sm., Nova Guinea 8: 64 (1901). Types: Dutch New Guinea: Southern New Guinea near Okaba, Aug. and Oct. 1907, Brandenhorst 30 and 118 (syn BO); Merauke, 1904-05, Koch s.n. (syn BO).
Occurs in far north-eastern Queensland on some Torres Strait islands and from Cape York to the Daintree River.
Altitude: 0-500 m.
Also occurs in Indonesia and New Guinea.
Epiphytic or lithophytic herb forming small to medium-sized clumps. Pseudobulbs erect, fusiform, 20-40 cm x 2-2.5 cm, yellowish or purplish, narrow at the base, hard, furrowed. Leaves 2-4, erect to prostrate, apical, distichous, sessile, base not sheathing stem; lamina ovate, 10-15 cm x 4-5 cm, dark green to yellowish, leathery, apex acute to unequally emarginate. Inflorescence a terminal raceme, stiffly erect, 150-200 mm long, from apical nodes on pseudobulb; pedicels 10-20 mm long. Flowers 5-10, resupinate, erect to porrect, star-shaped, 25-30 mm x 25-30 mm, clustered toward inflorescence apex, pale green or greenish yellow with purple-brown stripes and spots. Sepals and petals widely spreading, broad, overlapping, fleshy. Dorsal sepal obliquely erect, ovate, 8-10 mm x 7 mm. Lateral sepals widely divergent, ovate, 9-11 mm x 7-8 mm, bases fused to column foot. Petals obliquely erect, lanceolate, 8-10 mm x 4 mm. Labellum 12 mm x 8 mm, 3-lobed; lateral lobes triangular, erect; midlobe decurved, with deeply grooved warty ridge, constricted at the middle, apex emarginate. Column 3 mm long. Column foot elongate, curved, 10 mm long, almost at right-angles to column. Capsules pendulous, dehiscent.
Occurs in rainforests in brightly lit, humid situations growing on trees and boulders. Plants are often bleached yellowish green by the sun.
Flowering period: April-July.
Until recently known as Dendrobium bifalce.