Blepharocarya involucrigera— Northern Bollygum; Rose Butternut—ANACARDIACEAE

Blepharocarya involucrigera

Link to Images on Flickr.

Habitat—Grows in rainforest. Altitudinal range from near sea level to 800 m.

Distribution— Endemic to Queensland, occurring as a widespread species in both Cape York Peninsula and North East Queensland.

Description— A large tree in well developed rainforest but often occurring as a small tree in marginal situations particularly in the northern part of its range.

Local occurrences

Raintrees Diamond Beach and The North Coast Regional Botanic Gardens Coffs Harbour.

Leaves.—Compound, entire, alternate, leaflets more than 12, domatia present, rachis not extending beyond last leaflet, milky or watery sap exuding from cut petioles. Twigs exuding a small quantity of clear resin. Numerous pale brown lenticels on the twigs. Upper surface of the compound leaf rhachis ± flat and the margins angular or slightly winged, particularly below the basal pair of leaflets. A rib usually visible on the underside of the basal part of the compound leaf rhachis and then running down the twig to the next pair of leaves. Leaflet blades about 5 to 15 x 1.5 to 4.5 cm. Individual leaves simple, lanceolate, apex long acuminate, petiole long and slender.

Blepharocarya involucrigera
Blepharocarya involucrigera

Inflorescence.— Flowers crowded, more or less in dense heads surrounded by a number of bracts. Male flowers: Flowers about 2 to 2.5 mm diam., sepals about 1 x 1 mm, petals about 1.5 x 1 mm. Anthers about 0.5 mm long, filaments about 1.5 to 2 mm long. Female flowers: Flowers about 1.5 mm diam., tepals about 1.5 mm long. Style and stigma about 1.5 mm long. Brownish.

Flowering.—Spring

Fruit.— Individual fruits about 7 to 10 x 4 to 5 mm, green, ripening brown, margins fimbriate with pale hairs. Fruits borne in a capsule–like involucre of long linear bracts. 'Capsules' about 20 to 30 x 15 to 20 mm. Inverted umbrella–shaped clusters of bracts, about 2 to 3 cm diameter, normally present beneath mature trees.

Ripe.—Summer

Blepharocarya involucrigera