Flora of North America species comparison

procumbent, pubescent in lines, glabrate.

prostrate to procumbent, villous, glabrate.

sessile;

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

axillary, sessile;

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

bracts keeled, ca. 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 white, ovate to lanceolate, 2–3.5 mm, apex acuminate, hairs not barbed;

stamens 5;

anthers 3–5, globose;

pseudostaminodes subulate, margins laciniate.

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.

lenticular, 0.9–1.1 mm.

ovate-orbiculate, 1–1.5 mm.

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

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