O. Ryding (2006) Otostegia. Flora of Somalia 3: 322-325
Plants shrubs or subshrubs, with unbranched hairs only. Inflorescences thyrselike or spicate, open or dense; bracts more or less leaflike; cymes with 1-30 flowers; bracteoles present; pedicels up to 1 mm long.Calyces (5)10-lobed, more or less bilaterally symmetric, 10-ribbed, tubes with a ring of hairs in the upper part, limbs expanded, widely funnel-shaped or almost flat, the ventral (lower) side usually larger than the dorsal (upper); corollas 2-lipped; upper lips hooded, more or less falcate, longer than or as long as the tubes, margins densely hairy and bearded, the hairs whitish or creamish, tips emarginate; lower lips straight or deflexed, about as long as the upper lips, white, 3-lobed, the midlobes somewhat larger than the other 2; stamens included in the upper corolla lips; style branches equal or lower branches slightly longer, Nutlets obovoid,with or without sessile glands at the top.
Otostegia includes 7 species (POWO 2022-08-07), several of the species previously included in the genus having been transferred to other genera. Five of the species included in the Flora of Somalia remain in Otostegia. One species (Otostegia somala has been transferred to Isoleucas.
Key to the species of Otostegia in Somaliland and Somalia.