A genus of small herbs, or upright or scrambling shrubs, which have alternate or radical leaves. The flowers are held in terminal spikes or racemes and are usually yellow, white, or purple. The calyx is lobed and the sepals are united at the base but split open on one side only. The 5 petals are fused at the base, often winged, and arranged in 2 lips with 3 lobes on the lower and 2 on the upper. The stigma has a cup-shaped cover with stiff hairs around the lip. The 5 stamens are free. The fruit is a small 2-celled capsule containing the flat seeds. There are about 170 species, all endemic (see endemism) to Australia, except for 1 species found throughout south-western Asia.
Subjects: Plant Sciences and Forestry.