Flora of North America species comparison

erect, branched at base and in inflorescence.

erect-ascending, unbranched or branched from base, unbranched proximal to inflorescence, conspicuously ribbed distally.

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.

proximal 5–20 pairs opposite, distal opposite or alternate, erect to spreading;

stipular glands absent;

blade elliptic to oblanceolate or obovate, 15–35 × 4–10 mm, margins entire, not ciliate, apex obtuse or acute.

panicles, with ascending to spreading branches.

elongate panicles.

0–3 mm.

0–4 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, lanceolate to ovate, 1.5–3.5 mm, margins not scarious, eglandular or inner with a few delicate small marginal glands, apex acute or apiculate;

petals pale yellow, obovate, 2.7–4.6 mm;

stamens 1.5–2 mm;

anthers 0.3–0.7 mm;

staminodia absent;

styles distinct, 1.2–2 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.

globose, carpels convex abaxially, 1.3–1.9 × 1.8–2.3 mm, apex depressed, dehiscing freely into 10, 1-seeded segments, segments falling freely, false septa nearly complete, proximal margins not ciliate.

1.2–1.9 × 0.7–1.1 mm.

1–1.4 × 0.5–0.7 mm.

= 36.

= 36.