Mauve (H2) flowers, VIII–IX; pale grey foliage; open habit with twisted stems; height 31–45cm; spread 46–60cm.
Introduced by William R. A. Parsons (Wood Close, Upper Woolhampton, Berkshire, England) before 1973.
Named after W. R. A. Parsons, and alluding to the foliage colour. The first name ends with an s, so it is followed by an apostrophe and an s — Parsons’s.