Radcl.-Sm. (Dunkley) 1996 - Radcliffe-Smith A (1996) Notes on African Euphorbiaceae XXX: Phyllanthus (V) & c. Kew Bulletin 51(2): 301-331. doi: 10.2307/4119325.
There is no corrections for Cleistanthus polystachyus subsp. milleri yet.