Flora of North America species comparison

erect, branches 1–several from base, unbranched proximal to inflorescence.

spreading-ascending, branching basally in inflorescence, sometimes throughout.

proximal 4–10 pairs opposite, distal alternate, erect to spreading;

stipular glands absent;

blade of proximal leaves spatulate, central and distal elliptic, oblanceolate, or obovate, 15–25 × 3–7 mm, margins entire, not ciliate, apex acute to apiculate.

basal leaves opposite, or alternate throughout, spreading;

stipular glands usually present;

blade linear to linear-lanceolate, 10–25 × 1–4 mm, margins entire or few small teeth on distal leaves, not ciliate, apex acute; mostly 3-nerved.

corymbs.

dense, ± flat-topped panicles.

1–10 mm.

4–20 mm.

sepals persistent, lanceolate-ovate, inner shorter, broader, thinner than outer, outer sepals 2–4 mm, margins not scarious, inner sepals usually with a few small, sessile glands along margin distal to middle, rarely eglandular, outer ones entire, apex acute to acuminate;

petals yellow, obovate (sometimes notched at apex), 3–5.5 mm;

stamens 1.2–3 mm;

anthers 0.5–1 mm;

staminodia absent;

styles distinct, 1–2 mm;

stigmas capitate.

sepals deciduous, lanceolate, inner somewhat broader, 6–12 mm, margins of inner sepals densely and delicately glandular-toothed, outer ones scarious, conspicuously and more coarsely but less densely glandular-toothed than inner, apex acute or attenuate;

petals yellow to orange, sometimes reddish below middle, broadly obovate, 11–19 mm;

stamens 4–9 mm;

anthers 1–2 mm;

staminodia absent;

styles connate nearly to apex, 6–9 mm;

stigmas capitate.

globose, carpels flattened or ± concave abaxially, 1.3–1.8 × 2–2.5 mm, apex depressed, dehiscing freely into 10, 1-seeded segments, segments falling freely, false septa nearly complete, proximal margins usually sparsely and inconspicuously few-ciliate.

broadly ovoid to triangular-ovoid, tapering abruptly to flattened base, 3.6–4.7 × 3–4 mm, thick- or thin-walled, apex obtuse, dehiscing into 5, 2-seeded segments, segments blunt or subacute, persistent on plant, false septa complete, proximal part membranaceous, not terminating in loose fringe, distal part cartilaginous, margins not ciliate.

1–1.5 × 0.6–0.9 mm.

2.6–3.4 × 1–1.6 mm.

= 36.

= 30.