Succulent perennials or (rarely) annuals, with bulbs, corms, rhizomes or tubers and often with separate fertile and sterile shoots. Inflorescences composed of cymes, each cyme subtended by a spathe, consisting of 2-ranked sessile or subsessile flowers and usually conspicuous herbaceous bracteoles. Flowers actinomorphic, bisexual. Calyx tubular below. Corolla with a short tube, 3 lobes blue, purple or pink. Stamens 6, equal, all fertile. Ovary 3-locular. Capsule narrowly ovoid. Worldwide: 50 species, in the Old World tropics Burundi: 5 taxa. Insects associated with this genus:
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| Species | Content | |
| caespitosa Kotschy & Peyr. | ||
| foecunda Hassk. | Description, Image | |
| lanata Benth. | Description, Image | |
| longifolia Benth. | Description, Image | |
| vaga (Lour.) Schult. & Schult.f. |