Flora of North America species comparison

branched from base (proximal branches longer), 5–20 dm, viscid-pubescent.

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

petiole length 1/3–1/6 blade;

blade elliptic to lanceolate, becoming very narrow near inflorescence, 10–25 cm, apex acuminate, surfaces viscid-pubescent, somewhat scabrous adaxially.

sessile;

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

few-branched, somewhat leafy; flowering crepuscular.

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

0.5–2 cm.

0.3–0.7 cm.

calyx strongly purple-veined, 1–2 cm, membranous, viscid-pubescent (hairs without swollen bases), lobes long-triangular, unequal, longest equaling tube;

corolla straight, 2.5–10 cm (excluding limb), viscid-puberulent externally, tube white or white tinged with greenish purple, sometimes striped, 0.8–4 cm × 2–3 mm, widening to throat 1–4 × 5 mm, glabrous or minutely puberulent internally, limb spreading, white, circular, 2–4 cm diam., lobes shallow, deltate or emarginate;

stamens inserted near base of throat, included;

filaments unequal, in 2 equal or unequal pairs, 4 cm, 1 filament shorter than either pair, pubescent proximally;

style straight, just surpassing longest stamen pair.

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.

tearing along membranous sinuses, covering ca. 1/2 of mature capsule.

not tearing at sinuses, just covering capsule.

broadly ovoid, 1–1.2 cm.

narrowly ovoid, 0.8–1.1 cm.

0.9–1 mm.

0.5 mm.

leaves: petiole length equaling blade;

blade ovate or orbiculate, 6–12 cm, surfaces viscid-pubescent, somewhat scabrous adaxially.

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

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

= 24.

= 24.