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Scale bar 10mm. Copyright CSIRO
10th leaf stage. Copyright CSIRO
Cotyledon and 1st leaf stage, epigeal germination. Copyright CSIRO
Alstonia spectabilis subsp. ophioxyloides
Alstonia spectabilis subsp. ophioxyloides (F.Muell.) P.I.Forst.
Forster, P.I. (1992) Australian Systematic Botany 5(6): 758. Type: ?.
Alstonia ophioxyloides F.Muell., Fragmenta Phytographiae Australiae 1: 57(1858), Type: Northwrn Territory, Towards the Fitzmaurice River, Oct. 1855, F. Mueller; lecto: GH; iso: K, MEL. Fide Monachino, Pacific Sci. 3: 163 (1949).
Yellowjacket; Leatherjacket; Jackapple; Milkwood; Hard Milkwood
Twigs and petioles produce a milky exudate. Leaves in whorls of 3-5. Leaf blades lanceolate, elliptic or obovate, variable in size but up to 36 x 12.5 cm, petioles about 1.5-2.5 cm long. Lateral veins about 18-20 on each side of the midrib, curving and often forming loops just inside the blade margin. Lower surface of the leaf blade clothed in pale hairs.
Flowers about 3.5-5 mm diam. Calyx lobes about 1.5-2.2 mm long, densely pubescent on the outer surface, glabrous on the inner surface or sparsely pubescent near the apex. Corolla tube about 3.5-4.9 mm long, densely pubescent on the outer surface, lobes about 1.5-2.6 mm long, densely pubescent on both the inner and outer surfaces, with the right margins overlapping. Stamens inserted near the throat of the corolla tube. Anthers about 0.9-1 x 0.6-0.7 mm.
Cotyledons about 12-15 x 4-5 mm. First pair of leaves narrowly elliptic, about 12-20 x 4-6 mm, margins smooth, both the upper and lower surfaces of the leaf blades glabrous. At the tenth leaf stage: leaf blade long and narrow, about 12 x 1.5 cm, plant almost entirely glabrous.
Distribution and Ecology