Brummitt, R.K. (1985) Additions to the tropical African species of Isoglossa (Acanthaceae) Kew Bulletin 40 785-791
Herbs or soft shrubs. Inflorescence terminal or axillary, thyrsoid or spicate. Bracts and bracteoles small. Calyx actinomorphic, 5-lobed. Corolla 2-lipped; upper lip 2-lobed with distinct rugula; lower lip shortly 3-lobed with 2 raised ridges on the palate. Stamens 2, fertile, 2-thecous; staminodes 0. Pollen grains spherical. Worldwide: c.50 species, Old World tropics to Arabia Mozambique: 7 taxa. Insects associated with this genus:
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| Species | FZ divisions | Content |
| ciliata (Nees) Engl. | GI | |
| floribunda C.B. Clarke subsp. floribunda | N,Z,T,MS,GI | Description, Image |
| glandulosissima K. Balkwill | M | |
| grandiflora S.Moore | T | |
| milanjiensis S. Moore | T,MS | Description, Image |
| namuliensis I. Darbysh. & T. Harris [End] [CR] | Z | |
| sp. A | Z |