P. Sanguisorba: stem glabrous, seldom above a foot high; leaves pinnate; leaflets many, small, ovate, deeply-toothed; flower-heads small, almost globular, light green, seldom acquiring a purplish tinge, the lower flowers all male with the numerous stamens projecting in hanging tufts, the upper female with a long style ending in a purple tufted stigma. - Dry pastures and limestone rocks. Fl. July.