Flora of North America species comparison

usually branched near base, occasionally with distinct trunk (branches drooping), 10–60(–100) dm, glabrous, somewhat glaucous.

single (slender and wiry), with long basal branches, 2–10 dm, tuberculate-hispid.

petiole length 1/2 blade (not winged);

blade ovate to lanceolate, 5–25 cm, base acute or cordate, apex rounded, (rubbery), surfaces glabrous, glaucous.

sessile;

proximal blades rounded to ovate, distal blades lanceolate to linear-lanceolate, 1–5 cm, base clasping, apex acuminate and often twisted, surfaces hispid.

branched, not leafy; flowering diurnal.

simple or few-forked to more rarely many times branched, few-flowered, not leafy; flowering crepuscular.

0.3–1 cm.

0.3–0.7 cm.

calyx green, (evenly cylindric), 1–1.5 cm, without membranous sinuses, glabrous or minutely pubescent, lobes sharply triangular, equal, much shorter than tube;

corolla straight, 2.5–4.5 cm (excluding limb), glabrous or finely pubescent externally, tube bright yellow to greenish yellow, (cylindric to clavate, slightly constricted apically), 0.5–0.8 cm × 3 mm, widening slightly to throat 1.5–4 cm × 6–8 mm, glabrous within, limb assurgent, greenish yellow or bright green (usually distinct color from tube in young flowers), turning yellow and same color as tube with age, circular or pentagonal, 0.6–0.8 cm diam., lobes rounded, broadly triangular, equal;

stamens inserted at base of throat, extending to corolla mouth;

filaments subequal 2.5–4.5 cm, (geniculate at base), glabrous;

style straight, exceeding stamens and exserted from corolla mouth.

calyx green or purplish green, elliptic to ovate, 10-ribbed, 0.8–1.3 cm, sinus membranes long, minutely hispid, lobes linear-subulate, equal, length ± equaling tube, tips somewhat spreading;

corolla straight, 2.5–3.5 cm (excluding limb), puberulent, tube and throat not clearly differentiated, white or greenish-gray tinged, 2.5–3.5 cm, gradually widening from 1 mm to 2 mm diam., abruptly swollen to 4 mm diam., just below contracted mouth, glabrous or minutely puberulent internally, limb spreading or slightly reflexed, cream or white, stellate, 1 cm diam., lobes white adaxially, ivory or greenish purple or with purplish veins abaxially, ovate-acute;

stamens inserted just below mouth (4 inserted 0.4 cm below mouth, one 0.4 cm lower), included;

filaments free for at least some of their length (anthers not sessile), 4 nearly shorter than 0.1 mm and sometimes unequal, one 1 mm, glabrous;

anthers to 0.1 mm;

style straight, equaling or just exceeding stamens.

not tearing along sinuses, covering mature capsule.

not tearing at sinuses, just covering capsule.

ovoid, 0.7–1.5 cm.

narrowly ovoid, 0.8–1.1 cm.

0.5 mm.

0.5 mm.

trees or shrubs.

leaves: petiole short and broad-winged or leaves sessile;

blade spatulate, obovate, or oblanceolate, 5–30 cm, surfaces hispid.

= 24.

= 24.