Hovea planifolia, is a species of flowering plant in the family Fabaceae and is endemic to Queensland, Australia. It is a shrub with very narrowly elliptic, lance-shaped or strap-like leaves, purplish flowers and oval or egg-shaped pods.
Hovea planifolia is a shrub that typically grows to a height of up to , with branchlets covered in grey hairs. Its leaves are very narrowly elliptic, lance-shaped or strap-like, long and wide on a petiole long, with more or less flat edges, the upper surface smooth with a few scattered weak hairs. There are stipules long at the base of the leaves. The flowers are borne in groups of three on a peduncle long, each flower on a pedicel long. The flowers are pinkish-purple at first, later purplish, with narrowly egg-shaped to egg-shaped bracts and bracteoles long. The sepals are long, forming a tube long, the upper lip about wide. The standard petal is long with a green-yellow centre, the wings wide. Flowering occurs in August and September and the fruit is a sessile or subsessile, densely hairy pod. The seed has an aril about long.
This species was first formally described in 1926 by Karel Domin who gave it the name Hovea longifolia subvar. planifolia in Bibliotheca Botanica from specimens collected near the Brisbane River. In 1989, James Henderson Ross raised the variety to species status as Hovea planifolia in the journal Muelleria. The specific epithet (planifolia) means 'flat-leaved'.
This hovea grows in sandy soils or on sandstone outcrops in forest, woodland and heath in south-eastern Queensland between Salvatora Rosa National Park and Mount Bangalora near the border with New South Wales.