Perennial herbs or soft shrublets. Leaves opposite. Inflorescences lax terminal or axillary racemes. Flowers in 2-6-flowered whorls; bracts persistent. Calyx 5-toothed, 2-lipped, accrescent; upper tooth largest, ovate, erect; 4 lower teeth equal, horizontal, lanceolate-triangular or subulate. Corolla ± equally 4-lobed; lobes flat. Stamens 4, included in corolla tube. Nutlets subcircular or oblong. Worldwide: 17 species in tropical and South Africa and India Angola: 6 taxa. |
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| Species | Provinces | Content |
| membranaceus (Benth.) Ayob. ex A.J.Paton & Harley | ||
| obtusifolius (E. Mey. ex Benth.) N.E.Br. | Description, Image | |
| palustris A.J.Paton & Goyder [End] | BI,MO | |
| tereticaulis (Poir.) M.R. Ashby | Description, Image | |
| tubulascens (Briq.) M.Ashby [End] | ||
| villosus (Briq.) M.R. Ashby |