I did not observe any thorns on this example and the leaves are glabrous as opposed to tomentose. The flower petals are pale green-yellow whereas the numerous stamens are long and white. It apperars that this is a variable species and that some of the populations have been given other names such as C. polymorpha. A character I found interesting is how the stamens thicken and curl as the flower senesces. The leaves are highly toxic to goats and as a result this woody plant is sometimes abundant on over-grazed lands.

Above and below from near Voi, Kenya. May 2017.