Flora of North America species comparison

4–18-flowered;

bracts caducous.

40+-flowered, spikelike, bearing flowers in conelike head, often apparently terminal;

bracts conspicuous, covering buds, caducous as pedicel elongates, firm, yellow to light orange, 10+ mm.

13–23 mm.

4–11 mm.

monosymmetric;

calyx brownish to greenish yellow;

corolla golden yellow, longest petal 8–16 mm;

androecium heterantherous, stamens 7, middle stamens 1/2 as long as abaxial or smaller, staminodes 3;

anthers of middle stamens to 3.6–4.8 mm, of abaxial stamens 5.2–6.5 mm, dehiscing by nearly U-shaped pore, apical appendage inconspicuous;

gynoecium incurved, ovules 34–50;

ovary hairy;

style slightly incurved.

asymmetric (enantiostylous);

calyx yellow;

corolla bright yellow to yellow-orange, bowl-shaped, petals monosymmetric, lower and upper petals similar in shape, firm, strongly concave, longest petal 15–24 mm;

androecium heterantherous, stamens 7, staminodes 3;

anthers of middle stamens 2.6–4 mm, of abaxial stamens 9.5–13 mm, dehiscing by 1 or 2 short slits, apical appendage 0;

gynoecium incurved, ovules 44–58;

ovary densely hairy;

style incurved.

somewhat pendulous, cylindrical, straight, 40–120 × 6–10 mm, corrugated over seeds, indehiscent.

ascending, flat, straight or slightly curved, tetragonal, 110–190 × 9–12 mm, carinate by sutures and winged along middle of each valve, tardily dehiscent.

dull brown or dark reddish brown, obliquely obovoid or oblong-ellipsoid.

dark brown, rhomboid.

= 28.

= 24.