Stenocarpus cryptocarpus, commonly known as the giant-leaved stenocarpus, is a species of flowering plant in the family Proteaceae and is endemic to north Queensland. It is a tree with buttress roots at the base, simple, mostly elliptical adult leaves, groups of cream-coloured flowers and narrow oblong follicles.
Stenocarpus cryptocarpus is a tree that typically grows to a height of up to, with a dbh of up to . It is a canopy tree and has buttress roots at the base. The leaves of young plants are bipinnate, up to long on a petiole long. Adult leaves are simple, elliptic, more or less oblong or egg-shaped with the narrower end towards the base, and long on a petiole long.
The leaves are glossy green and covered with woolly, rust-coloured hairs when young. The flower groups are arranged in leaf axils near the ends of branches with up to 20 flowers on a peduncle long. The individual flowers are cream-coloured, strongly perfumed and long, each flower on a pedicel long. Flowering occurs from December to April and the fruit is a narrow oblong follicle up to long.
Stenocarpus cryptocarpus was first formally described in 1988 by botanists Don Foreman and Bernie Hyland in the journal Muelleria from specimens collected by Hyland from North Queensland in 1969. The specific epithet (cryptocarpus) means "hidden-fruited".[1]
Giant leaved stenocarpus grows in rainforest at altitudes up to between Cooktown and Innisfail.