Total: 2
The smallest species in the genus with a flattened, tuberous caudex 2-8cm tall and up to 40cm in diameter, resembling a rock or cluster of potatoes. Virtually branchless with sparse leaves in rosettes. Produces bright yellow trumpet-shaped flowers. Strictly adapted to acidic substrates with pH 3.5-4.5.
A pachycaul succulent shrub or small tree with a swollen caudex that stores water. Grows 2-4m tall in habitat. Produces clusters of trumpet-shaped flowers primarily in pink and red shades. Evergreen or drought-deciduous depending on conditions. Contains cardiac glycosides in all parts, making it highly toxic if ingested.