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. DRC: 1 taxon. |
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| Species | Botanical divisions | Content |
| affinis (Roem. & Schult.) DC. var. fugax (Vatke) Verdc. | Description, Image |