UW Burke Herbarium species comparison

Leaves alternate, oblanceolate to linear, 3-8 cm. long and 3-6 mm. wide, with a wing down the stem below each leaf 4-15 mm. long, the blades loosely white-woolly and with sessile glands.

Lowermost leaves oblanceolate, up to 4.5 cm. long and 1 cm. wide, the others progressively reduced upward.

Heads in loose to dense, flat-topped inflorescences;

involucres broadly top-shaped, 5-6 mm. long;

involucral bracts in 3-4 series, usually shiny and whitish, glabrous, ovate to oblong;

corollas all tubular, the outer pistillate, 35-55, the inner perfect, 4-7;

pappus of capillary bristles.

Heads in several tight clusters, in a close inflorescence;

involucre 3.5-5 mm. high, woolly only at the base, its bracts translucent, light brown;

corollas all tubular, whitish, the outer slender and pistillate, the few inner coarser and perfect;

pappus of capillary bristles united at base.

Achenes rigid, roughened.

Achenes small, nerveless.