Flora of North America species comparison

erect or ascending, occasionally decumbent, moderately or profusely branched, primarily distally, 1–5 dm, minutely puberulent with bent hairs basally, glabrous or minutely puberulent distally.

procumbent or decumbent to ascending, sparingly branched throughout, 1–4 dm, minutely puberulent with bent hairs throughout.

mostly in basal 1/2 of plant;

larger leaves with petiole 4–8[–15] mm, blade broadly ovate or oval to lanceolate, 10–21[–35] × 6–8[–13] mm (distal leaves smaller, proportionately narrower), adaxial surface usually glabrous, rarely minutely puberulent, abaxial surface paler than adaxial, glabrous, neither surface punctate, base round [obtuse], margins shallowly sinuate, apex acute, obtuse, or round.

± throughout;

larger leaves with petiole 3–12 mm, blade rhombic-ovate to ovate or lanceolate, 15–25 × 9–15 mm (distal leaves smaller, proportionately narrower), adaxial surface glabrous or sparsely puberulent, abaxial surface paler than adaxial, glabrous, neither surface punctate, base round to obtuse, margins entire or slightly sinuate, apex acute.

terminal or axillary, forked ca. 3–6 times ± evenly (or clearly unevenly), diffuse, with sticky internodal bands;

branches usually terminating in umbels or flowers borne singly, usually well beyond leaves.

terminal or axillary, without sticky internodal bands;

peduncle, 1–3 cm, bearing small capitate clusters of flowers.

pedicel 0.3–4.5 mm;

bracts at base of perianth quickly deciduous, 2, linear-lanceolate to lanceolate [ovate], 0.5–0.6 mm;

perianth whitish to pale pink or purplish, campanulate beyond constriction, 1 mm;

stamens 2–3, included or barely exserted.

pedicel 0.3–0.6 mm;

bracts at base of perianth quickly deciduous, lance-acuminate, 0.4–0.7 mm;

perianth white to pale pinkish, campanulate distal to constriction, 1–1.5 mm;

stamens 2, included or barely exserted.

1–7 per umbel, straw colored or gray-brown, obpyramidal, 2.5–3.1 × 1.3–1.9 mm (l/w: 1.6–2.1), base stipelike, apex round-truncate, glabrous;

ribs 3–4(–5), acute or winglike, tapering to pedicel, slightly rugose or undulate near sulci;

sulci 0.5–1 times as wide as base of ribs, coarsely transversely rugose, smooth or very faintly papillate.

2–8 per cluster, pale green to straw colored, broadly obpyramidal, base tapered to stipelike above pedicel, 2.9–3.4 × 2.8–3.2 mm (l/w: 1–1.4), apex truncate, glabrous;

ribs 3–4, winglike, smooth;

sulci 3–4 times as wide as base of ribs, coarsely transversely rugose, not papillate.