Prickly vygie - Calvinia

Prickly vygie - Calvinia

Observation - Prickly vygie - Calvinia - Southern Africa. Description: Dense rounded shrub about 30 cm high, few succulent leaves. Most bushes had only one flower. Any ideas about this?

Dense rounded shrub about 30 cm high, few succulent leaves. Most bushes had only one flower. Any ideas about this?