Opisthiolepis heterophylla—Blush Silky Oak—PROTEACEAE

Opisthiolepis heterophylla

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Habitat—Grows in well developed rainforest on a variety of sites but is probably more common in upland and mountain rain forests and probably reaches its best development on soils derived from basalt.

Distribution— Endemic to North East Queensland, widespread in the area. Altitudinal range from near sea level to 1150 m.


Local occurrences

Raintrees Diamond Beach

Leaves.—Simple, alternate, entire on mature trees. At the tenth leaf stage: leaf blade ± elliptic, apex acuminate, base attenuate; margin serrate, teeth about 5 to 7 on each side on the upper half of the leaf blade; upper surface with reddish brown hairs along the midrib, undersurface densely hairy with prostrate, brown hairs. Lobed or compound leaves not usually present until 12th leaf or later. Young leaves white on the underside but mature leaves brown. Oak grain in the twigs. Leaf blades about 2 to 23 x 2 to 9 cm. Petioles about 1.5 to 5 cm long, grooved on the upper surface. Petioles on young leaves shortly winged but as the wings are folded inwards they are inconspicuous and difficult to observe.

Opisthiolepis heterophylla
Opisthiolepis heterophylla

Inflorescence.—Flowers sessile, in pairs, without a common peduncle. Flower bracts pubescent, wider than long, about 0.7 by 1.3 mm. Tepals glabrous, curved, about 2.5 to 5 mm long. Hypogynous gland one, bilobed. Ovary glabrous, shortly stalked. Ovules about 8.


Fruit.—About 10 to 12 x 2.5 to 3 cm. Seeds about 8 to 9 x 2 to 2.5 cm with a ± continuous marginal wing. Embryo about 40 by 20 mm.