Grevillea Robusta

Grevillea Robusta, commonly known as the southern silky oak, silk oak or silky oak, silver oak, or Australian silver oak, is a flowering plant in the family Proteaceae. It is a tree, the largest species in its genus but is not closely related to the true oaks, Quercus. It is a native of eastern coastal Australia, growing in riverine, subtropical, and dry rainforest environments.

Grevillea robusta is an evergreen tree with a single main trunk that grows quickly and can reach heights of 5 to 40 meters. The bark is wrinkled and dark grey. Its fern-like leaves are between 10 and 34 cm in length, 9 to 15 cm in width, and have between 11 and 31 primary lobes. Sometimes there are as many as four additional lobes that are each linear to narrowly triangular in shape. Just before blossoming, several of its leaves are lost. The blooms are grouped in one-sided, "toothbrush"-like groupings that are 12 to 15 cm long and occasionally branching. Each flower's female component, the carpel, has a stalk that is 21–28 mm long. The glabrous flowers are primarily yellowish orange, though occasionally they can be scarlet. From September through November, there is flowering, and a glabrous follicle is a fruit that results.