Flora of North America species comparison

erect, branched at base and in inflorescence.

erect, usually multiple from base, sometimes 1, unbranched or few-branched proximal to inflorescence, slender, wiry, prominently ribbed in inflorescence.

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.

early deciduous, alternate or basalmost opposite, appressed-ascending;

stipular glands present, reddish, becoming dark;

blade linear, 5–15 × 0.5–1.2 mm, margins entire or with scattered minute marginal glands, not ciliate, apex acute; 1-nerved.

panicles, with ascending to spreading branches.

cymes.

0–3 mm.

0–2 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 or inner ones sometimes obovate, outer sepals 2.5–3.6 mm, margins hyaline, not scarious, all glandular-toothed, apex acuminate;

petals yellow, obovate, 4–6.5 mm;

stamens 3 mm;

anthers 0.3–0.7 mm;

staminodia present or absent;

styles distinct, 2–3 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.

pyriform, 2–2.5 mm diam., apex pointed, dehiscing readily into 10, 1-seeded segments, segments falling freely, false septa incomplete, margins of septa ciliate.

1.2–1.9 × 0.7–1.1 mm.

1–1.5 × 0.6–1 mm.

= 36.

= 36.