Grows along streams, under or at the edge of forest or northern slopes on cultivated land. Similar to P. merrilliana but with pollen stephanocolpate (vs. pantoporate) and pinnae being pinnatilobate to pinnatiparte (vs. pinnipartie to pinnatisect). This species is biennial, glabrous, with 2-10 scapes per plant of 1 or 2 superimposed umbels of pink distylous or homostylous flowers, lobes obovate, apex rounded.