Flora of North America species comparison

sparsely branched; glabrous or glabrate.

(stipules bristlelike), petiole 1.5–3.5 cm;

leaflets 3, blade elliptic, 2–6 × 0.6–1.5 cm, margins entire, weakly sinuate, or serrulate, apex acute, long-acuminate, or mucronate, surfaces glabrate (margins with sparse, relatively long hairs when young).

1–4 cm (4–30 cm in fruit);

bracts unifoliate, obovate, 4–22 mm.

(green to purple), 8–20 mm.

sepals persistent, connate 1/2–2/3 of length, purple to green, lanceolate, 1.7–4 × 1–2 mm, margins denticulate, glabrous;

petals purple (rarely white), oblong to ovate, 7–12 × 3–6 mm;

stamens purple, 18–24 mm;

anthers (green), 2–2.3 mm;

gynophore 1–15 mm in fruit;

ovary 5–7 mm;

style 0.1–0.5 mm.

(erect) not inflated, 23–76 × 3–6(–7) mm, striate, (glabrous).

12–38, black, globose or horseshoe-shaped, 2.8–4 × 2.5–3 mm, rugose.

= 34, 60.