Flora of North America species comparison

sparsely branched distally (central stem dominant); glabrous.

usually sparsely branched proximally (without a dominant central stem); glabrous.

stipules (scarious) 0.5–1 mm;

petiole 0.8–2 cm;

leaflet blade linear-elliptic, 1.5–4.5 × 0.2–0.7 cm, thin, margins entire, apex acute, surfaces glabrous.

stipules 3–5-fid, (larger, more conspicuous in inflorescences), 0.5–1.5 mm (scarious);

petiole 0.4–2(–2.7) cm;

leaflet blade narrowly oblong-elliptic, 0.8–2.6 × 0.1–0.8 cm, thin, margins entire, apex obtuse to retuse, mucronulate, surfaces glabrous.

racemes, terminating stems and branches, 1–15 cm (2–20 cm in fruit);

bracts unifoliate, 5–25 mm.

corymbs or racemes, terminating stems, 1–2 cm (2–3.5 cm in fruit);

bracts ± rudimentary.

ascending in fruit, 5–10 mm (6–12 mm in fruit).

slightly ascending in fruit, 6–7 mm (7–11 mm in fruit).

sepals green, lanceolate, 0.9–2.2 × 0.5–0.7 mm, glabrous;

petals yellow or orange, oblong, 3.5–5(–7) × 1.4–1.6(–2) mm, hairy abaxially;

stamens yellow, 8–12 mm;

anthers 1.5–1.9 mm;

gynophore ascending, 6–10 mm in fruit;

ovary rhomboidal, 1–1.5 mm;

style 0.8–1.2 mm.

sepals green, deltate, 1–1.5 × 0.5–0.6 mm, glabrous;

petals yellow, oblong, 3–5 × 1–1.3 mm, glabrous;

stamens (well-exserted), yellow, 7–9 mm;

anthers 1.4–1.6 mm;

gynophore spreading, 2.5–6(–8) mm in fruit;

ovary obovoid, 1.3–1.5 mm;

style 0.7–1 mm.

ovoid to rhomboidal, 2.5–5 × 2.5–6(–8) mm, glabrous.

rhomboidal (widest distal to midpoint), 2–5 × 3–5(–6.5) mm, glabrous.

2–4, silver-gray with black mottling, globose, 2–2.2 mm, smooth.

(1 or) 2–4(–7), stramineous becoming black, globose, 2–2.5 mm, smooth.