Herbs or subshrubs. Inflorescence axillary, an umbel-like group of monochasical cymes. Primary bracts leaf-like. Calyx actinomorphic; 4- or 5-lobed. Corolla 2-lipped, resupinate; lip in upper position 3-toothed with an indistinct rugula; lip in lower position entire or emarginate. Fertile stamens 2, 1-thecous; staminodes 0. Pollen prolate. Derivation of name: From hypo (under) and estia (a house) (Greek), referring to the covering of the calyx by the bracts Worldwide: c.40 Old World tropics Burundi: 4 taxa. Insects associated with this genus:
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| Species | Content | |
| aristata (Vahl) Roem. & Schult. | Description, Image | |
| cancellata Nees | ||
| forskaolii (Vahl) Roem. & Schult. subsp. forskaolii | Description, Image | |
| triflora (Forssk.) Roem. & Schult. | Description, Image |