or perennial herbs, terrestrial or epiphytic. Leaves simple, spirally arranged,
alternate or opposite, exstipulate. Flowers bisexual, resupinate, regular,
axillary racemes or fascicles, or solitary, 1 to many together, pedunculate.
Sepals 3, rarely 5, coloured, imbricate, lateral sepals 2, much smaller than
petals, lower sepal with a short or long spur. Petals 5, lateral 4 united to
pairs. Stamens 5, anthers cohering. Ovary 5-locular, ovules many, stigma
sessile, 5-toothed. Fruits 5-valved capsules, loculicidally dehiscent. Seeds
smooth or tubercled, glabrous or hairy.