Alstonia spectabilis R.Br. subsp. spectabilis
Brown, R. (1992) Australian Systematic Botany 5(6): 756.
Hard Cheesewood; Jackapple; Leatherjacket; Milkwood, Hard; Milky Yellowwood; Yellowjacket; Bitterbark; Hard Milkwood
Living bark quite bitter when chewed. Brown or orange-brown stripes in the inner blaze.
Twigs and petioles produce a milky exudate. Leaves in whorls of three or four. 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 glabrous.
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 narrowly elliptic, about 12-15 x 4-5 mm. First pair of leaves elliptic, about 18 x 6 mm, margins smooth, both the upper and lower surfaces of the leaf blade glabrous. At the tenth leaf stage: plant entirely glabrous. Leaf blade long and narrow, about 12 x 1.5 cm. Seed germination time 14 to 16 days.
Apical dominance in this species is maintained in the same way as Alstonia muelleriana.