Small shrubs or suffrutices. Leaves opposite. Flowers usually in
cymes, or solitary and axillary, or in terminal spikes or heads with reduced leaves; bracts and bracteoles sometimes spiny. Calyx 4-partite; segments unequal, leaf-like or membranous, sometimes spiny, the two outer enclosing the inner. Corolla ± actinomorphic, 4-5-lobed or ± 2-lipped, with a tubular base; lobes obovate, sometimes unequal. Stamens 2 or 4, not didynamous. Ovary 2-locular with 2 ovules per loculus. Capsule solid in upper part;
seeds flat with hygroscopic hairs. Derivation of name: After Jacques Barrelier (1606-1673), a Dominican monk and French botanist Worldwide: 250 species in the tropics Rwanda: 2 taxa. The larvae of the following species of insect eat species of this genus: |
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