Flora of North America species comparison

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

erect to ascending, much-branched, 3–10(–15) dm, ± glandular-pubescent.

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, distal leaves sessile;

petiole to 18 mm;

blade ovate to oblong-lanceolate or lanceolate, proximal ones mostly lanceolate, 2–8(–12) × 0.5–4(–5.5) cm, base cuneate, margins entire, dentate, or laciniate, apex obtuse to attenuate, copiously gland-dotted (rarely glabrous).

axillary glomerules;

glomerules subglobose, 4–6 mm diam.;

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

lateral spikes, 3–7 cm;

glomerules globose, 1.5–2.3 mm diam.;

bracts leaflike, lanceolate, oblanceolate, spatulate, or linear, 0.3–2.5 cm, apex obtuse, acute, or attenuate.

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 4–5, connate for ca. 1/2 their length, distinct portion ovate, rounded abaxially, 0.7–1 mm, apex obtuse, glandular-pubescent, covering seed at maturity;

stamens 4–5;

stigmas 3.

ovoid;

pericarp adherent, membranaceous, slightly rugose and papillate.

ovoid;

pericarp nonadherent, rugose to smooth.

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

seed coat smooth.

horizontal or vertical, reddish brown, ovoid, 0.6–1 × 0.4–0.5 mm;

seed coat rugose to smooth.