Flora of North America species comparison

mesophyllous, 11–26 cm, glabrous or glabrate;

stipules caducous;

extrafloral nectary 1, base of petiole, sessile or subsessile;

leaflet pairs 4 or 5(or 6), blades lanceolate- or ovate-acuminate, 45–100 × 12–38 mm.

usually (1 or)2–5-flowered;

bracts caducous, longer than bud, often blackish green.

usually 5–25-flowered;

bracts caducous.

8–21 mm.

0–5 mm.

monosymmetric;

calyx pinkish or fuscous;

corolla yellow, longest petal 12–17 mm;

androecium heterantherous, stamens 6, staminodes 3 + 1;

anthers of middle stamens 3.2–5.2 mm, of abaxial stamens 4.9–6.6 mm, elongated beyond pores, dehiscing by U-shaped pore, apical appendage linguiform, thickened;

gynoecium incurved, ovules 40–60;

ovary densely hairy;

style slightly incurved.

monosymmetric (similar to S. lindheimeriana but smaller);

calyx usually pale green, rarely yellow;

corolla yellow, longest petal 8–10.5 mm;

androecium heterantherous, stamens 7, staminodes 3;

anthers 3–5 mm, dehiscing by 1 apical pore, apical appendage 0;

gynoecium linear, ovules unknown;

ovary densely hairy;

style incurved.

ascending, flat, slightly curved or straight, linear, 80–135 × 6.5–9.5 mm, corrugated over seeds, dehiscent.

erect, flat, straight or slightly incurved, 40–120 × 3.5–6.5 mm, shallowly corrugated over seeds, dehiscent.

olive green or brownish, obovoid.

brown, obovoid or oblong-obovoid.

= 26, 28.