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 Uganda: 1 taxon. Insects associated with this genus:
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| Species | FTEA divisions | Content |
| gregorii (S. Moore) Lindau | Description, Image |