UW Burke Herbarium species comparison

Basal and lower cauline leaves oblanceolate, toothed to lyrate-pinnatifid, 3-15 cm. long and 5-35 mm. wide, usually deciduous; middle and upper cauline leaves smaller, becoming linear-oblong and entire upward.

Basal leaves lyrate and pinnatifid, up to 20 cm. long and 5 cm. wide;

cauline leaves smaller, becoming linear and entire upward.

Heads few to numerous;

involucre 8-15 mm. high, broader toward the base, its middle and outer bracts spine-tipped, the central spine 5-9 mm. long; the inner bracts purple tinged;

flowers yellow, all alike;

pappus 1.5-3 mm. long;

receptacle strongly bristly.

Heads several, broader toward the base;

involucre 10-15 mm. high, its middle and outer bracts spine-tipped, the larger spines 11-22 mm. long;

flowers yellow;

pappus of the outer flowers wanting, that of the others 3-5 mm. long;

receptacle densely bristly.