P. coronopifolium belongs to the section Campylia.
Here a white flowering form of P. coronopifolium grown from seed. (The flowers usually are pink to purple).
The leaves are thick and leathery.

Section Campylia

Subspecies of P. ovale with dark pink flowers.

Photo © Edgar

The white form of P. tricolor is native to South Africa, around Eseljagpoort.

Photo © Edgar