Flora of North America species comparison

prostrate, forming mats, often fistulose, glabrous.

ascending to spreading, often clambering, pubescent, 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 or elliptic, 1.8–8 × 0.5–3 cm, herbaceous, apex long-acuminate or acute, sparsely strigose or glabrous.

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 yellowish white, subglobose to cylindric, 0.9–2.5(–4) × 0.9–1 cm;

bracts keeled, less than 1/2 as long as tepals.

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

stamens 5;

pseudostaminodes ligulate.

tepals monomorphic, green, lanceolate, 3.4–4.7 mm, apex acute, villous, hairs not barbed;

stamens 5;

pseudostaminodes ligulate, margins laciniate.

not seen.

ovoid, 1.2–1.3 mm.

not seen.

included within tepals, greenish yellow, ellipsoid, 2.5 mm, apex acute.