About Grevillea diffusa Sieber ex Meisn.
Grevillea diffusa Sieber ex Meisn. is most commonly a compact shrub that usually grows up to 50 cm (20 in) tall, though it sometimes grows as an erect shrub reaching 2 m (6 ft 7 in) in height. Its leaves are elliptic, lance-shaped (with the narrower end positioned toward the base), or linear. The leaves measure 20–130 mm (0.79–5.12 in) long and 1–10 mm (0.039–0.394 in) wide, have silky hairs on their lower surface, and have edges that are curved downward or rolled under. The flowers are arranged in dome-shaped to roughly spherical groups, and their colour ranges from dark red, dark crimson to burgundy, or scarlet, depending on the subspecies. The pistil is usually 6–11 mm (0.24–0.43 in) long, and the style is strongly curved and more or less glabrous (hairless). Flowering occurs between July and November, and the fruit that develops is a glabrous follicle. This species of grevillea grows in forest or woodland, and occasionally in swampy heath. It is restricted to Hawkesbury sandstone in the Sydney basin. Three subspecies have distinct ranges within this area: subspecies constablei occurs south of Sydney from Waterfall to Helensburgh and near the Georges River; subspecies diffusa occurs from the lower Georges River to the Illawarra region; and subspecies filipendula occurs between Calga and Mount White, north of Sydney.
