[2][3] Henry Nicholas Ridley, the English botanist who first formally described the species, named it after the wavy (undulatus in Latin) edges of its leaves.

Its oblong, hairless leaves are 17.8 by 7 centimeters with wedge shaped bases, cusped tips and wavy margins.

Its 3 red, oval, ribbed, hairy sepals are 0.6 centimeters long.

Its red, leathery, oval to lance-shaped, hairy outer petals are 1.5 - 3.2 by 0.6-1.75 centimeters long.

[2] Bioactive molecules extracted from its roots have been reported to be cytotoxic in tests with cultured human cancer cell lines.