"Fls all ligulate and perfect, yellow; invol campanulate or narrower; achenes columnar to fusiform, but scarcely beaked, with a whitish basal callosity, ca 10-ribbed; pappus of 5–many members, these commonly with paleaceous base and slender, bristle-like tip, varying (in spp. approaching Agoseris) to merely obscurely flattened capillary bristles; lactiferous herbs with a taproot, entire to pinnatifid lvs, and 1–many heads on long naked peduncles. 25, chiefly w. U.S."
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