Heads radiate, the rays pistillate and fertile, often few; invol bracts strongly imbricate, glutinous, herbaceous-tipped; receptacle flat to conic or hemispheric, alveolate and evidently pubescent; disk-fls perfect and fertile; style-branches flattened, with long, slender, externally short-hairy appendage; achenes ± clavate, pubescent, usually several-nerved; pappus of the disk-fls of 1–2 series of white, erose scales evidently shorter than the cor, often united at base (rarely none), that of the rays ± reduced or even obsolete; taprooted herbs or shrubs, generally glabrous and often glutinous, with alternate, narrow, entire, commonly punctate lvs and usually numerous small yellow heads in a terminal, often flat-topped infl. 15, N. Amer.
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