Annual or perennial herbs. Stipules with 1-several fimbriae. Leaves opposite. Flowers bisexual, heterostylous or isostylous, in terminal or axillary inflorescences, sometimes fasciculate or solitary at nodes. Calyx lobes 4 (in ours). Corolla lobes 4. Ovary 2-locular. Capsule subspherical to oblong, usually with a beak. Derivation of name: after Hendrik Bernhard Oldenland, c. 1663-1699, German-born South African botanist. Worldwide: 300 species in the tropics, especially in Africa. Burundi: 14 taxa. |
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| Species | Content | |
| affinis (Roem. & Schult.) DC. var. fugax (Vatke) Verdc. | Description, Image | |
| capensis L.f. [Agg] | ||
| corymbosa L. var. corymbosa | Description, Image | |
| corymbosa L. var. caespitosa (Benth.) Verdc. | Description, Image | |
| corymbosa L. [Agg] | ||
| echinulosa K.Schum. [Agg] | ||
| goreensis (DC.) Summerh. var. goreensis | Description, Image | |
| herbacea (L.) Roxb. var. herbacea | Description | |
| herbacea (L.) Roxb. [Agg] | Description, Image | |
| lancifolia (Schumach.) DC. var. scabridula Bremek. | Description, Image | |
| lancifolia (Schumach.) DC. [Agg] | ||
| nervosa Hiern | ||
| rosulata K.Schum. [Agg] | ||
| scopulorum Bullock |