This name is a synonym of Carduus nyassanus (S.Moore) R.E.Fr..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 2727931) with original publication details: J. Linn. Soc., Bot. 37: 326 1906.
This name was in version 1 of The Plant List, record tro-2727931.