There are about 360 species of Grevilleas. They are a member of the Protea family, genus Proteaceae. The best known hybrid is Grevillea Robyn Gordon. It has spidery red flowers and is a favourite of many Australian gardeners.
Grevillea robusta is the largest species in the genus Proteaceae and grows to a height between 18 to 35 metres. It can reach in excess of one metre in diameter.