Cadetia subradiata

Cadetia subradiata (J.J.Sm.) Schltr., Bot. Jahrb. Syst. 58 (1922) 91.

Basionym: Dendrobium subradiatum.

Roots to more than 7 cm long, 1 mm diameter. Rhizome creeping, mat-forming. Pseudobulbs crowded, narrowly fusiform, 7-10 mm long, 2-2.5 mm diameter. Leaf narrowly ovate to oblong, index 3-6, 1-1.3 cm by 2-3.5 mm, subpetiolate, apex obtuse, minutely bilobulate, mucronate, mucro longer than the lobules. Inflorescences terminal from the leaf axil and subterminal just below the abaxial side of the leaf, solitary, at the base with a 2-4 mm long tubular sheath. Peduncle 5-7 mm long. Ovary and pedicel 1.6-2.2 cm long, 6-winged, glabrous. Flower c. 1 cm across. Median sepal patent, patent, elliptic, 6 by 2.2 mm, obtuse, 3-nerved. Lateral sepals elliptic, 5.6 by 2.4 mm, obtuse, 3-nerved; mentum cylindrical, straight, 2.2 mm long, apical closed part 1.8 mm long, apex rounded. Petals porrect, obliquely elliptic, 5.5 by 2 mm, entire, margin undulate in natural position, papillose, obtuse, 3-nerved. Lip spathulate, 3-lobed, densely pubescent on basal half of midlobe and median longitudinally on the hypochile; hypochile 5.8 mm long, of which 2 mm fused with the column foot, 3 mm wide across the lateral lobes; lateral lobes semiorbicular, 1 by 1 mm, entire, apex rounded; midlobe obcuneate-quadrangular, 2.2 by 2.2 mm, fleshy, entire, apex slightly retuse, obscurely mucronate, more or less recurved, callus none. Column 1.5-1.8 mm long, glabrous, wings ovate, entire, clinandrium entire, median with a narrow triangular tooth; foot 2.2 mm long. Anther cucullate, 0.7 by 0.7 mm, base deeply bilobulate, apex truncate, slightly papillose; pollinia 0.7 mm long. Fruit not seen.

Colours: Flower white.

Habitat: Terrestrial on sandy rocky cliffs and steep gravelly road-cuts. Altitude 1800 to 1850 m.

Flowering time in the wild: January, April, October, December.

Distribution: New Guinea (endemic).

Distribution in New Guinea: Papua (Manokwari Regency: Arfak Mountains).

Map: SUBRAMAP.JPG [Cadetia subradiata (J.J.Sm.) Schltr., distribution map.]

Notes: Cadetia subradiata is a very distinct species, characterised by the creeping, mat-forming habit together with the 3-lobed, strongly pubescent lip and the broad undulate petals. It appears to be endemic to the Arfak Mountains.

Cultivation: Intermediate growing terrestrial, prefers light position.