Tridentea was reinstated in July 1978 by
Leach. The genus was first described by Howarth in 1812 but Leach's
definition is quite different to Howarths.
The species in this genus comprises plants from the four sections
in the genus Stapelia (White & Sloane), the Tridentea section
being one, two sections from the genus Caralluma and Stapelianthus
baylissii is included as well.
The identifying characteristics of the genus Tridentea are;
Stem is obtusely or obscurely angled an glabrous.
Inflorescence: Peduncle, pedicel, calyx and corolla exterior
glabrous, corolla rugose, glabrose or asperulous inside, often
ciliate with vibratile hairs, never hairy as in Stapelia.
Leaves: widely spreading, awl-shaped, estipulate, relatively large
or absent. The
name Tridentea is derived from the outer corona lobes which are three toothed.