Flora of North America species comparison

erect, branched at base and in inflorescence.

erect or shortly decumbent at base, becoming erect, branched from near base.

opposite near base or alternate throughout, appressed-ascending;

stipular glands present;

blade linear to linear-lanceolate, 8–20 × 0.5–2.1 mm, margins entire or with scattered minute marginal glands, not ciliate, apex acute; 1-nerved.

usually only proximalmost opposite, sometimes to midstem, distal alternate, erect to ± spreading;

stipular glands absent;

blade of proximal leaves narrowly to broadly elliptic-oblanceolate, 10–15 × 1.5–2.5 mm, margins entire, not ciliate, apex subacute to acuminate; 1-nerved.

panicles, with ascending to spreading branches.

slender thyrses.

0–3 mm.

1–4 mm.

sepals persistent, lanceolate to ovate, 2.5–5 mm, margins of inner sepals narrowly scarious, conspicuously glandular-toothed, apex acute or acuminate;

petals lemon yellow, oblanceolate or narrowly obcordate, 7–11 mm;

stamens 2–8 mm;

anthers 0.5–1 mm;

staminodia present;

styles distinct, 3–6.5 mm;

stigmas capitate.

sepals persistent, linear-lanceolate to lanceolate, 3–5.3 mm, margins not scarious, inner ones conspicuously glandular-toothed, outer entire or very sparsely glandular-toothed, apex acute to acuminate;

petals yellow, oblanceolate, 4–7 mm;

stamens 3–5 mm;

anthers 1–1.5 mm;

staminodia absent;

styles distinct, 1.5–3 mm;

stigmas capitate.

ovoid, 2–3 × 2–2.5 mm, apex sharp-pointed, dehiscing readily into 10, 1-seeded segments, segments falling freely, false septa incomplete, false and true septa margins ciliate.

triangular-ovoid to broadly ovoid, 2.5–3.5 × 2.7–3.5 mm, apex obtuse, somewhat tardily dehiscing into 10, 1-seeded segments, segments persistent on plant, false septa incomplete, proximal margins ciliate.

1.2–1.9 × 0.7–1.1 mm.

2–2.5 × 1.1–1.3 mm.

= 36.

= 26.