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. Malawi: 22 taxa. |
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| Species | FZ divisions | Content |
| affinis (Roem. & Schult.) DC. var. fugax (Vatke) Verdc. | N,S | Description, Image |
| angolensis K. Schum. var. angolensis | N | Description, Image |
| capensis L.f. var. capensis | N,S | Description, Image |
| capensis L.f. var. pleiosepala Bremek. | S | Description |
| corymbosa L. var. corymbosa | N,C,S | Description, Image |
| corymbosa L. var. caespitosa (Benth.) Verdc. | N,C,S | Description, Image |
| corymbosa L. var. linearis (DC.) Verdc. | N,C | Description |
| echinulosa K. Schum. var. echinulosa | N,C | |
| echinulosa K. Schum. var. pellucida (Hiern) Verdc. | N | |
| fastigiata Bremek. | N,S | |
| goreensis (DC.) Summerh. var. trichocaula Bremek. | N | Description, Image |
| goreensis (DC.) Summerh. var. goreensis | N,C,S | Description, Image |
| herbacea (L.) Roxb. var. herbacea | N,C,S | Description |
| herbacea (L.) Roxb. var. goetzii Bremek. | N | Description |
| herbacea (L.) Roxb. var. papillosa (Chiov.) Bremek. | N | Description |
| herbacea (L.) Roxb. [Agg] | N,C,S | Description, Image |
| hockii De Wild. | ||
| lancifolia (Schumach.) DC. var. scabridula Bremek. | N,C,S | Description, Image |
| machingensis Verdc. [End] | S | |
| nematocaulis Bremek. var. nematocaulis | N | |
| rosulata K. Schum. var. parviflora Bremek. | N,C,S | |
| rupicola (Sond.) Kuntze var. rupicola | S | Description, Image |