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Caelospermum purpureum

Family

Rubiaceae

Botanical Name

Caelospermum purpureum Halford & A.J.Ford

Halford, D.A. & Ford, A.J. (2009) Austrobaileya 8(1): 70. Type: Queensland. Cook District: Daintree National Park, SE ridge of Mt Hemmant, above Noah Creek, 5 June 2007, A.J. Ford AF5084Jensen..

Synonyms

Randia sp. Boonjee (BG 5345), : (), Type: ?.

Stem

Usually flowers and fruits as a shrub 2-5 m tall, occasionally grows into a small tree to 10 m tall.

Leaves

Stipules about 2 mm long, interpetiolar, fused at the base and encircling the twigs. Leaf blade about 10-11 x 3-4 cm. Leaves glabrous, +/- elliptic with a well developed drip tip at the apex. Venation difficult to distinguish but the lateral veins forming loops inside the blade margin. Petiole flat or ridged on the upper surface. Twigs glabrous.

Flowers

Flowers pleasantly perfumed. Calyx (hypanthium) cup-like, glabrous, tube about 6-7 mm long, lobes minute. Corolla tube about 7-8 mm long, lobes about 11-12 mm long, reflexed at anthesis but the tips inflexed or hooked. Corolla glabrous outside but sparsely hairy on the inner surface near the point of attachment of the anthers. Anthers about 8-9 mm long. Style inserted in the centre of a fleshy disk at the apex of the ovary. Stigmas about 4 mm long.

Fruit

Fruits change colour from yellow to brown overnight as they ripen. Fruits pyriform, about 10-14 x 10-14 mm, calyx remnants persistent at the apex. Pyrenes four, each about 8 mm long. Embryo small, about 3-5 mm long, cotyledons slightly wider than the radicle and about one third of the length of the embryo.

Seedlings

Cotyledons ovate or narrowly triangular, about 20-32 x 15-21 mm, shortly petiolate or +/- sessile, drawn out into a point at the apex. Margins undulate, at least towards the apex. Stipules short and blunt, about 1.5 mm long. First pair of leaves opposite, margins entire, glabrous. At the tenth leaf stage: leaf blade narrowly elliptic to slightly obovate, about 9-10 x 3 cm, petiole about 3-4 mm long. Stipules about 3-4 mm long, connate at the base.

Distribution and Ecology

Endemic to NEQ, known from three distinct and disjunct populations in the Cooktown area (Mt Finnigan), the Cape Tribulation area, and in the Topaz-Towalla area including Mt Bartle Frere. Altitudinal range from 80-1360 m. Grows as an understory plant in undisturbed well developed upland and mountain rain forest.

NEQ

X

Shrub (woody or herbaceous, 1-6 m tall)

X

Tree

X

RFK Code

3285