Flora of North America species comparison

prostrate, forming mats, often fistulose, glabrous.

prostrate to procumbent, 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 rhombic-ovate, oval, or obovate, usually longer than broad, 0.5–2.5 × 0.3–1.5 cm, apex rounded, apiculate, sparsely villous, 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 white to stramineous, ovoid, 0.5–0.8 × 0.4–0.6 cm;

bracts shorter than tepals, apex long-attenuate, aristate.

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

stamens 5;

pseudostaminodes ligulate.

tepals dimorphic, whitish to stramineous, lanceolate, 3–5 mm, apex acuminate, spinose tipped, densely villous, hairs barbed;

stamens 5;

pseudostaminodes triangular or subulate, shorter than filaments, margins usually entire, rarely dentate.

not seen.

ovate-orbiculate, 1–1.5 mm.

not seen.

included within tepals, brown, ovoid-orbicular, 1.5 mm, apex slightly truncate.