The stems are erect, nearly simple, striated, hairy, 
one-flowered. Leaves pilose, pinnatifid, decurrent upon the 
dilated petiole, which is sheathing at its base ; the segments 
cut, most usually two-lobed; the upper leaves entire. 
Involucrum imbricated in a nearly simple series, with linear 
obtuse leaflets, palest at the edge. Rays entire, white, 
rolling back after flowering. Pappus short, many-parted. 
J. L. 
