Flora of North America species comparison

prostrate, branched, 3–5 dm, pilose and glandular-pilose, or with sessile glands.

erect to ascending, branched at base to ± simple, 1–6(–10) dm, pubescent with short-stalked glandular hairs.

aromatic;

petiole 0.7–1 cm;

blade ovate or elliptic, 1.3–2.1 × 1.1–1.5 cm, reduced somewhat in inflorescence, base cuneate, apex obtuse, glandular-pubescent.

aromatic;

petiole to 2.5 mm;

blade 1.3–4 × 0.6–2.7 cm, base cuneate, margins lyrate-sinuate, pinnatifid, or occasionally entire (in distal leaves), apex acute to subobtuse, glandular-pubescent abaxially.

axillary glomerules;

glomerules subglobose, 4–6 mm diam.;

bracts similar to cauline leaves, elliptic, reduced to 0.8 mm, margins crenate-dentate, apex obtuse.

axillary cymes, often arranged in terminal thyrses, 12–24 cm, subtended by cauline leaves;

bracts absent.

perianth segments 5, distinct nearly to base, distinct portions elliptic to oblong, strongly keeled, 1.8–1.9 × 0.3–0.5 mm, apex acuminate, fimbriate and hirsute, pubescent with septate hairs, hardly enclosing fruit, becoming white, strongly crested and 5-winged vertically, rostrate, semiorbiculate, and cartilaginous in fruit;

stamen 1;

stigmas 2.

perianth segments 5, distinct nearly to base, distinct portion elliptic or ovate to oblong, 0.7–1.1 × 0.5–0.7 mm, apex acute to obtuse, rounded abaxially, densely glandular-pubescent, covering fruit at maturity;

stamens 1–3(–5);

stigmas 2.

ovoid;

pericarp adherent, membranaceous, slightly rugose and papillate.

subglobose;

pericarp adherent, membranaceous, papillose, becoming rugose, usually white-blotchy.

reddish brown, ovoid, 0.6–0.7 × 0.5–0.6 mm, margins slightly keeled over radicle and grooved over cotyledons;

seed coat smooth.

globose to subglobose, (0.5–) 0.6–0.8 × 0.5–0.7 mm, margins rounded (rarely indistinctly furrowed);

seed coat rugose.

= 18.