Flora of North America species comparison

prostrate, forming mats, often fistulose, glabrous.

erect, villous, glabrate.

sessile;

blade narrowly elliptic, elliptic, or oblanceolate, 3.5–7.1 × 0.5–2 cm, herbaceous, apex acute to obtuse, glabrous.

sessile;

blade ovate to lanceolate, 1–7 × 0.7–1 cm, herbaceous, villous.

terminal and axillary, pedunculate;

heads white, globose, 1.4–1.7 cm diam.;

bracts not keeled, less than 1/2 as long as tepals.

terminal and axillary, pedunculate;

heads white, globose, 0.7–1 cm diam.;

bracts keeled, shorter than to equaling tepals.

tepals monomorphic, white, lanceolate or oblong, 6 mm, apex acute, glabrous;

stamens 5;

pseudostaminodes ligulate.

tepals monomorphic, green to stramineous, lanceolate, 3–4 mm, apex acuminate, villous, hairs not barbed;

stamens 5;

pseudostaminodes ligulate, margins fimbriate.

not seen.

ovoid-oblong, 1.4 mm.

not seen.

included within tepals, brown, ellipsoid, 2 mm, apex acute.