Silvery Big Grevillea robusta (also known as Silky Oak and Silver Oak) is a species of flowering plant in the family Proteaceae, endemic to eastern Australia. Growing up to 40 metres (130 ft) tall, it is a large, fast-growing tree with a silvery sheen to its leaves, which are divided into 20-30 small, round, toothed lobes. The flowers are yellow and appear in spring and early summer. The fruit is an oval, woody capsule, containing one or two seeds.