Cyclophyllum costatum (C.T.White) S.T.Reynolds & R.J.F.Hend.

Rubiaceae

Reynolds, S.T. & Henderson, R.J.F. (2001) Austrobaileya 6(1): 44. 

Flowers and fruits as a shrub about 2-4 m tall but may grow to 8 m.

Stipules interpetiolar, about 1 x 2 mm, glabrous, broad-based and abruptly narrowed into an acuminate tip at the apex. Leaf blades about 7-8 x 3.3-4.2 cm, petioles short, about 0.1-0.5 cm long, grooved on the upper surface. Lateral veins forming definite loops well inside the blade margin. Domatia absent. Terminal buds usually resinous.

Inflorescences 1-3 flowered, with flowers on short, thick peduncle. Flowers 4 or 5-merous, strongly perfumed; pedicel 10-17 mm long; calyx and pedicel 11-19 mm long; lobes 1-1.5 mm long; corolla pale yellow, 13-15 mm long, with tube 10-11 mm long; corolla lobes 3-3.5 mm long.

Fruits about 13-14 x 11-13 mm, laterally compressed, with 8 or 9 prominent longitudinal ribs, and bilobed, each lobe containing one seed. Seeds about 9-12 x 8 mm. Embryo about 9 x 1 mm, radicle much longer than the cotyledons. Seed slighly wrinkled.

Features not available.

Endemic to NEQ. Altitudinal range apparently from 960 to 1100 m. Grows in well developed lowland and upland rain forest.

Distinguishable by the long, somewhat compressed calyx tube, pedicel wings, strongly ribbed fruits, and membranous leaves when dry.

Canthium costatum C.T.White, Contributions from the Arnold Arboretum of Harvard University 4: 99(1933), Type: Daintree River, common in rain-forest, .. L.J. Brass, no. 2261 (type; flowering and fruiting specimens), Mar 11, 1932 .., holo:?A