This name is a synonym of Acalypha parvula var. chathamensis (B.L.Rob.) G.L.Webster.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 336) with original publication details: Proc. Amer. Acad. Arts 38: 163 1902.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:1168-2.
This name was in version 1 of The Plant List, record kew-336, and has not been changed.