Alstonia spectabilis subsp. ophioxyloides (F.Muell.) P.I.Forst.
Forster, P.I. (1992) Australian Systematic Botany 5(6): 758.
Yellowjacket; Leatherjacket; Jackapple; Milkwood; Hard Milkwood
Living bark quite bitter when crushed. Bark often cork-like.
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. Seed germination time 20 days.