Flora of North America species comparison

prostrate, forming mats, often fistulose, glabrous.

prostrate, villous.

sessile;

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

sessile;

blade oval to obovate, usually as broad as long, 1.3–3 × 1.1–1.7 cm, apex rounded, pilose, glabrate.

terminal and axillary, pedunculate;

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

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

axillary, sessile;

heads stramineous, globose to ovoid, 0.6–1 × 0.6–0.7 cm;

bracts equaling tepals, apex attenuate.

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

stamens 5;

pseudostaminodes ligulate.

tepals dimorphic, stramineous, lanceolate, 5–7 mm, apex acuminate, spinose tipped, sparsely villous, hairs barbed;

stamens 5;

anthers 3–5, globose;

pseudostaminodes triangular, shorter than filaments, margins dentate.

not seen.

lenticular, 1.3–1.5 mm.

not seen.

included within tepals, brown, compressed, 1.8 mm, apex truncate.