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 Mozambique: 35 taxa. Insects associated with this genus:
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| Species | FZ divisions | Content |
| albostellata C.B. Clarke | T | Description, Image |
| ameliae A. Meeuse | Z,M | Description, Image |
| calophylloides Lindau subsp. pilosa I.Darbysh. | N | |
| capitata Klotzsch | T,MS | Description, Image |
| crossandriformis C.B.Clarke | GI,M | Description, Image |
| delagoensis Oberm. [NrEnd] | MS,GI,M | Description, Image |
| elegans C.B. Clarke subsp. orientalis I.Darbysh. | Z,MS,GI,M | Description, Image |
| fissimuroides I. Darbysh. [NrEnd] | MS | |
| fulvostellata C.B. Clarke subsp. mangochiensis I. Darbysh. [NrEnd] [EN] | N | |
| gueinzii Sond. | M | Description, Image |
| heterotricha Lindau subsp. heterotricha | M | |
| hirta Oberm. | MS,M | Description, Image |
| laceratiflora Lindau [NrEnd] | N | |
| lancifolia T. Anderson | GI | Description, Image |
| lugardii C.B.Clarke | T | Description, Image |
| matopensis S.Moore | MS,GI | Description, Image |
| mutabilis I. Darbysh. ined. | N | |
| nyasensis C.B. Clarke | N | |
| obtusa Nees | M | |
| obtusa × gueinzii | M | |
| oxyphylla Lindau [NrEnd] | M | |
| repens Nees | N,Z,MS,GI,M | Description, Image |
| rhynchocarpa Klotzsch | N | |
| saxatilis Oberm. | GI | |
| senensis Klotzsch | T,MS | Description, Image |
| setosa (Klotzsch) I. Darbysh. ined. [End] | N | |
| sp. D (near holubii) | GI | |
| spinulosa Klotzsch subsp. kirkii (T.Anderson) I.Darbysh. | T | Image |
| spinulosa Klotzsch subsp. spinulosa | N,Z,T,MS,GI | Description, Image |
| taitensis S. Moore subsp. rogersii (S.Moore) I.Darbysh. | GI | |
| tanzaniana (Brummitt & J.R.I. Wood) I. Darbysh. | N | |
| torrei I. Darbysh. ined. [End] | N | |
| ventricosa Hochst. ex Nees | MS | Description, Image |
| vollesenii I.Darbysh. [NrEnd] | N | |
| whytei S. Moore | N |