Family ApocynaceaeP. saundersii is a succulent shrub with a large stem up to 1.5 m high. The exposed tuberous stem is up to 1 m in diameter and produces several narrow, thorny branches.
The flowers are white, wax-like, tinged purplish pink and are borne from February to May. The glossy leaves are almost glabrous.
It naturally occurs from northern KwaZulu-Natal and the Lebombo Range into Mpumalanga and Limpopo Provinces ( South Africa ) to Swaziland, southern Mozambique and Zimbabwe.
This species grows in dry woodland amongst rocks or in rock crevices. The epithet honours Sir Charles James Renault Saunders.