Citation: R. Br. ex J. Knight, Cult. Proteaceae 93 (1809).

Derivation: Greek isos, equal; pogon, beard; alluding to the tufts of hairs at the apex of the perianth segments.

Synonymy: Not Applicable

Common name: None

Description:
Shrubs; leaves rigid, simple or compound, the blade or segments entire, toothed or lobed.

Flowers bisexual, in dense spikes (cones) surrounded at the base by empty outer bracts, each flower sessile in a bract (cone scale) and borne on a woolly-tomentose cylindrical to concave rhachis or receptacle, the scales and bracts separating readily; perianth regular, with the laminae spreading at anthesis, the upper part deciduous as a whole leaving the base of the tube splitting on ripening of the seed; stamens perfect; anthers sessile within the laminae, linear, shortly apiculate by the extension of the connective; ovary sessile, 1-ovulate; style filiform, the pollen-presenter usually dilated or clavate, separated from the filiform brush by a constriction, with various parts pubescent or glabrous, rarely (outside S. Aust.) both regions continuous.

Fruiting cones with scales separating readily; fruit a small hirsute nut, not compressed or winged.

Distribution:  About 35 species, restricted to southern temperate Australia; with Petrophile called cone-bushes.

Biology: No text

Author: Not yet available