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Corolla white or often streaked with pink or red outside, salver-shaped; tube narrowly cylindrical, slightly widened at apex, glabrous or pubescent outside, with a patch of hairs at about the mid-point inside; lobes 5(6), elliptic to broadly elliptic, overlapping to right in bud, spreading, puberulous on both faces.
Flowers 5(6)-merous, borne in one axil near apex of lateral branches or brachyblasts, either solitary and sessile to shortly pedunculate or with up to 3 on a common peduncle; pedicels almost obsolete; bracteoles paired, ovate.
Seeds numerous, embedded in fleshy placental tissue, ± sublenticular; testa thin, reticulate, then often wrinkled to give a rugulose appearance; endosperm entire, horny; embryo erect.
Fruit spherical to fusiform, not ribbed, 1-locular (but showing remains of 2 septa in upper part and 4 septa in lower part); pericarp not markedly thick; calyx limb persistent.
Leaves opposite or frequently appearing fasciculate due to crowding, petiolate; domatia absent; stipules ovate but tightly in-rolled at apical node and readily caducous.
Calyx tube oblong-ovoid; limb well developed, tubular, divided into teeth near apex, pubescent, at least near apex inside, and with colleters present near apex inside.
Shrubs or small trees, with both spines and brachyblasts present or absent (see Bridson cit. sup. fig. 2 A–E).
Anthers 5(6), linear, almost sessile, attached near middle, with one quarter to one third exserted.
Pollen grains single.
