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 Malawi: 14 taxa. Insects associated with this genus:
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| Species | FZ divisions | Content |
| ameliae A. Meeuse | S | Description, Image |
| boehmii Lindau | N | |
| calophylloides Lindau subsp. pilosa I.Darbysh. | N,C | |
| capitata Klotzsch | S | Description, Image |
| crassa C.B. Clarke subsp. crassa | C | Description, Image |
| fulvostellata C.B. Clarke subsp. axillaris I. Darbysh. | C | |
| fulvostellata C.B. Clarke subsp. fulvostellata [NrEnd] [EN] | N | |
| fulvostellata C.B. Clarke subsp. mangochiensis I. Darbysh. [NrEnd] [EN] | S | |
| hirta Oberm. | S | Description, Image |
| holstii Lindau | C | Image |
| lactiflora Brummitt & Seyani | N | Description, Image |
| senensis Klotzsch | S | Description, Image |
| spinulosa Klotzsch subsp. spinulosa | N,C,S | Description, Image |
| ventricosa Hochst. ex Nees | S | Description, Image |