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 Zimbabwe: 33 taxa. Insects associated with this genus:
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| Species | FZ divisions | Content |
| affinis C.B. Clarke subsp. affinis | W,S | Description, Image |
| albostellata C.B. Clarke | N,W,E,S | Description, Image |
| ameliae A. Meeuse | N,W,C,E,S | Description, Image |
| aromatica Oberm. [End] [LR-nt] | N,W,E,S | Description, Image |
| bremekampii Oberm. | W | Description |
| capitata Klotzsch | N,W | Description, Image |
| coriacea Oberm. | S | Description, Image |
| crassa C.B. Clarke subsp. crassa | N,C,E,S | Description, Image |
| crossandriformis C.B.Clarke | S | Description, Image |
| elegans C.B. Clarke subsp. orientalis I.Darbysh. | S | Description, Image |
| eylesii S.Moore [End] | W,E,S | Description, Image |
| fissimuroides I. Darbysh. [NrEnd] | E | |
| heterotricha Lindau subsp. heterotricha | S | |
| heterotricha Lindau subsp. mutareensis I. Darbysh. [End] | E,S | |
| hirta Oberm. | C,E,S | Description, Image |
| holstii Lindau | E | Image |
| holubii C.B. Clarke subsp. holubii | W | Description, Image |
| hydeana I. Darbysh. [End] [DD] | C | Description, Image |
| lancifolia T. Anderson | E,S | Description, Image |
| lugardii C.B.Clarke | N,W | Description, Image |
| mackenii Hook.f. | N,W,C,S | Description, Image |
| macrostegia Nees | W,C | Description, Image |
| matopensis S.Moore | N,W,C,E,S | Description, Image |
| molensis Wild [End] [VU] | C,S | Description, Image |
| quadriloba Oberm. | S | |
| randii S. Moore | W,S | Description, Image |
| rhodesiaca Oberm. | N,W | Image |
| senensis Klotzsch | N,W,E,S | Description, Image |
| spinulosa Klotzsch subsp. kirkii (T.Anderson) I.Darbysh. | N,W,C,E,S | Image |
| spinulosa Klotzsch subsp. spinulosa | N,W,C,E,S | Description, Image |
| taitensis S. Moore subsp. rogersii (S.Moore) I.Darbysh. | N,W,S | |
| ventricosa Hochst. ex Nees | N,W,C,E,S | Description, Image |
| virgula C.B. Clarke | E,S | Image |