Radcl.-Sm. (Radcl.-Sm.) 1989 - Radcliffe-Smith A (1989) Notes on African Euphorbiaceae: XX. Acalypha (ii)., Etc. Kew Bulletin 44(3): 439-454. doi: 10.2307/4110363.
There is no corrections for Croton socotranus var. pachyclados yet.