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Corolla hypocrateriform to subcampanulate, the tube constricted near the base, tubular to campanulate above; lobes contorted, overlapping to the right.
Ovary of 2 free carpels each containing 8 ovules on the ventral placenta; style slender, cylindric; clavuncle annular, style 2-lobed.
Cymes terminal, sessile or pedunculate, few–many-flowered; flowers usually showy, pink, purple, yellow or partly white.
Conspicuous ternate spines (the central one often very reduced or absent) present at each node.
Seeds 8, ovate to oblong with an apical coma, endosperm scanty or absent.
Shrubs or small trees with thick succulent trunk and stems.
Disc cupular, lobed or replaced by 5 scale-like processes.
Calyx lobes imbricate, free almost to the base.
Leaves alternate or spirally arranged.
Fruit of 2 follicles.
Latex present.
