Annuals or perennials. Inflorescence composed of racemes, these digitate or borne upon an elongated central axis; spikelets 2-3(-5)-nate, rarely solitary. Spikelets pedicellate, awnless; lower floret barren; upper floret bisexual; lower glume small or 0; upper glume as long as the spikelet or shorter, exposing the upper lemma; lower lemma usually as long as the spikelet, typically with longitudinal lines of hairs between the nerves; upper lemma chartaceous to cartilaginous, longitudinally striate. Worldwide: c. 220 species in warm and tropical regions Burundi: 23 taxa. Insects associated with this genus:
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| Species | Content | |
| abyssinica (Hochst. ex A.Rich.) Stapf | ||
| acuminatissima Stapf | Description | |
| angolensis Rendle | Description | |
| atrofusca (Hack.) Camus | ||
| ciliaris (Retz.) Koeler | Description | |
| comifera Pilg. | Description | |
| complanata Goetgh. | Description, Image | |
| debilis (Desf.) Willd. | Description | |
| diagonalis (Nees) Stapf | Description | |
| gayana (Kunth) Stapf ex A. Chev. | Description | |
| gazensis Rendle | Description, Image | |
| longiflora (Retz.) Pers. | Description | |
| maitlandii Stapf & C.E. Hubb. | Description | |
| nuda Schumach. | Description | |
| pearsonii Stapf | Description | |
| perrottetii (Kunth) Stapf | Description, Image | |
| pseudodiagonalis Chiov. | Description | |
| pulchra Van der Veken | ||
| sanguinalis (L.) Scop. | Description | |
| siderograpta Chiov. | ||
| ternata (A. Rich.) Stapf | Description | |
| thouaresiana (Flüggé) A. Camus | Description | |
| velutina (Forssk.) P. Beauv. | Description, Image |