Alstonia linearis

Family

Apocynaceae

Botanical Name

Alstonia linearis Benth.

Bentham, G. (1868) Flora Australiensis 4: 314. Type: N. Australia. Cliffs of Brunswick Bay and Regents River, N.W. Coast, A. Cunningham..

Stem

Dead bark pale and corky.

Leaves

Twigs and petioles produce a milky exudate. Leaves in whorls of three. Leaf blades about 7-13 x 0.5-1.5 cm, petioles about 0.4-0.7 cm long. Lateral veins about 35-45 on each side of the midrib.

Flowers

Flowers about 4-6 mm diam. Calyx lobes about 1.2-1.9 mm long, glabrous inside but sparsely pubescent near the apices. Corolla tube about 3-3.5 mm long, lobes about 2.4-3 mm long, with the right margins overlapping. Stamens inserted near the middle of the corolla tube. Anthers about 0.8-0.9 x 0.3-0.4 mm.

Fruit

Fruits about 20-22 cm long. Seeds oblong, acuminate or acute at one or both ends, about 5-6 x 2-2.2 mm, hairs about 5-6 mm long.

Seedlings

Features not available.

Distribution and Ecology

Endemic to WA, a rare species with a restricted distribution, known only from the Kimberley Region. Altitudinal range from near sea level to about 300 m. Usually grows in open forest on sandstone but also found in monsoon forest and rain forest.

WA

X

Tree

X

RFK Code

912