Flora of North America species comparison

sparsely branched proximally (central stem dominant); glabrous.

sparsely or profusely branched (usually erect); glabrous, pubescent, or scabrous.

stipules 3–5-fid, 0.5–1 mm (scarious);

petiole 2–6(–8) cm;

leaflet blade elliptic, ovate, or ovate-oblong, 0.8–2.4 × 0.4–1.4 cm, thin, margins entire, apex obtuse to retuse, mucronulate, surfaces glabrous.

stipules (sometimes deciduous), 3–8-palmatifid, threadlike, or setaceous;

petiole without pulvinus (usually longer than leaflets);

leaflets (1 or) 3.

racemes, terminating stems, 3–10 cm (2–20 cm in fruit);

bracts unifoliate, 5–9 mm.

terminal, racemes, corymbs, or flowers solitary in distal leaf axils (sometimes remaining compact in fruit);

bracts usually present (pedicels often anthocyanic).

divergent in fruit, 5–12 mm (4.5–17 mm in fruit).

sepals green, ovate-lanceolate, 1–2 × 0.5–0.7 mm, glabrous;

petals yellow, oblong, (3.5–)4–8 × 1.8–2.2 mm, glabrous;

stamens (well-exserted), yellow, 8–12 mm;

anthers 2.5–3 mm;

gynophore ascending, 3.5–15 mm in fruit;

ovary ovoid, 1–1.3 mm;

style (0.7–)1–2 mm.

actinomorphic;

sepals persistent, connate basally (ca. 1/4 of length) [distinct], equal (each often subtending a nectary);

petals equal;

stamens 6 (usually exserted, distinct, equal);

filaments inserted on a discoid or conical androgynophore, glabrous;

anthers (ellipsoid), coiling as pollen is released;

gynophore reflexed, spreading, or ascending in fruit.

capsules, dehiscent (as long as or shorter than wide), rhomboidal, globose, deltoid, or ovoid (valves laterally expanded, falling away from round, persistent septum).

rhomboidal, 3.5–6 × 4–10.5 mm, glabrous.

(1 or) 2–6, stramineous, globose, 2–2.7 mm, smooth.

1–16, globose or reniform, not arillate, (cleft fused between ends).

= 20.