Flora of North America species comparison

prostrate, forming mats, often fistulose, glabrous.

procumbent, pubescent in lines, glabrate.

sessile;

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

sessile;

blade elliptic to oblong or oblanceolate, 1.2–5 × 0.5–2.2 cm, apex obtuse to acute, 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.

axillary, sessile;

heads white, subglobose or ovoid, 0.5–1.1 cm;

bracts keeled, ca. 1/2 as long as tepals.

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

stamens 5;

pseudostaminodes ligulate.

tepals white, ovate to lanceolate, 2–3.5 mm, apex acuminate, hairs not barbed;

stamens 5;

anthers 3–5, globose;

pseudostaminodes subulate, margins laciniate.

not seen.

lenticular, 0.9–1.1 mm.

not seen.

included within tepals, sides exerted in mature fruit, greenish stramineous, obcordate, 1.3–1.7 mm, apex retuse.