UW Burke Herbarium species comparison

Basal leaves well developed and larger than the cauline leaves or wanting;

cauline leaves 5-20 cm. long, bi- or tri-pinnatifid, the ultimate segments blunt or rounded.

Leaves numerous, 1-2 dm. long and nearly half as wide, usually sessile, pinnatifid, with winged rachis, the pinnae again pinnatifid, with broadly winged rachis, the pinnules often again toothed.

Heads several in a short, flat-topped inflorescence;

involucre bracts dry, imbricate, the margins and tip scarious; disk 8-15 mm. wide;

rays yellow, pistillate, short, barely surpassing the marginal disk flowers;

disk flowers yellow, perfect, with 5-lobed tubular corolla;

pappus a minute crown.

Heads numerous, commonly 20-200, the inflorescence with a broad, rounded top, the disk about 5-10 mm. wide;

involucre bracts imbricate, dry, the margins and tips papery;

corollas all tubular, 5-toothed, yellow;

pappus a minute crown.

Achene 5-ribbed, glandular.

Achenes 5-ribbed, glandular.