Flora of North America species comparison

mesophyllous, 10–27 cm, glabrous or glabrate;

stipules caducous;

extrafloral nectaries 1(or 2), base of petiole or, in some leaves, along petiole, sometimes also between first, and rarely subsequent, pair of leaflets, subsessile or shortly stipitate, globose-flattened;

leaflet pairs 4–8, blades obliquely lanceolate, 30–70 × 6–22 mm.

usually 5–40-flowered;

bracts caducous, green, equal to or shorter than bud.

10–26 mm.

monosymmetric;

calyx greenish or yellowish;

corolla yellow, longest petal 12–25 mm;

androecium heterantherous, stamens 7, staminodes 3;

anthers of middle stamens to 3.6–5 mm, of abaxial stamens 4–5.8 mm, elongated beyond pores, dehiscing by U-shaped pore, apical appendage short, linguiform, thickened;

gynoecium incurved, ovules 36–56;

ovary finely hairy;

style slightly incurved.

ascending, subcylindrical, slightly curved, 70–140 × 5–8.5 mm, corrugated over seeds, indehiscent.

olive green or smoke-gray, obovoid to oblong-ellipsoid.

pendula is often confused with close relative S. bicapsularis, which is absent from North America and has shorter pedicels, only to 5 mm (H.

. Irwin and R.

.

1982;

B.

et al.

).