This name is a synonym of Arenaria serpyllifolia subsp. leptoclados (Rchb.) Nyman.
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym with original publication details: Syst. Veg. 2: 396 1825.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:151825-1.
This name was in version 1 of The Plant List, record kew-2650314.