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 DRC: 25 taxa. Insects associated with this genus:
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| Species | Botanical divisions | Content |
| aenea I. Darbysh. | ||
| alata S.Moore | ||
| boehmii Lindau | ||
| brownii S.Moore | ||
| cinerea Champl. | ||
| cinnabarina Champl. | ||
| descampsii Lindau | XI | Description, Image |
| elegans S.Moore ex C.B.Clarke | ||
| elliptica Benoist [NrEnd] | ||
| gandhii Kottaim. | ||
| glutinosa Champl. | ||
| grandicalyx Lindau | ||
| grandipetala De Wild. | ||
| kaessneri S. Moore | ||
| lobelioides Champl. [End] | XI | Description |
| lukafuensis De Wild. | ||
| neurophylla C.B.Clarke | ||
| obtecta Champl. | ||
| oenotheroides Dum.Cours. | ||
| phaylopsis Milne-Redh. | Description, Image | |
| sceptrum-katanganum Champl. | ||
| velutina Champl. | Description, Image | |
| ventricosa Hochst. ex Nees | Description, Image | |
| verdickii De Wild. | ||
| villosa S.Moore |