This name is a synonym of Trifolium rytidosemium subsp. rivulare (Boiss. & Balansa) Ponert.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 13042140) with original publication details: Kew Bull. 25(3): 447 1971.
This name was in version 1 of The Plant List, record tro-13042140.