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.

5–55-flowered, not spikelike;

bracts early caducous, to 5 mm.

usually 5–40-flowered;

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

13–28 mm.

10–26 mm.

asymmetric, enantiostylous;

calyx greenish to yellow;

corolla yellow-orange, slightly dark-veined, longest petal 12–23 mm, highly asymmetric, 1 or both lower petals highly modified, strongly concave and folded over stamens (flag-shaped);

androecium slightly heterantherous, stamens 7 (similar in shape and size, abaxial ones slightly longer), staminodes 3;

anthers 2.8–5 mm, dehiscing by 2 short slits, apical appendage 0;

gynoecium incurved, ovules 46–70;

ovary glabrate, sometimes becoming hairy after fertilization;

style stout.

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.

pendulous, flat, straight, 220–370 × 80–140 mm, woody, indehiscent or splitting transversely into woody segments.

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

reddish brown, obovoid to oblong-obovoid.

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