Flora of North America species comparison

single or with few spreading lateral branches, 5–8(–10) dm, sparsely pubescent, usually not viscid, tuberculate.

sessile;

blade ovate to lanceolate or linear, 1–5 cm, progressively smaller and more linear towards inflorescence, base auriculate, apex acute to attenuate, surfaces coarsely viscid-pubescent.

false racemes, occasionally with few weak branches, not leafy; flowering crepuscular.

0.5–1.3 cm.

calyx green or occasionally somewhat purplish-tinged, 1.5–2.5 cm, tube elliptic, 10-ribbed, sinus membranes long and transparent, minutely pubescent, sometimes viscid, lobes usually spreading, subulate, ± equal, equaling tube;

corolla straight, 4–12 cm (excluding limb), puberulent externally, tube and throat not well differentiated, straight, white or often grayish white, 2 mm diam. at base, gradually widening and somewhat broader in distal 1/4, abruptly swollen to 6 mm diam. just below constricted mouth, glabrous or minutely puberulent internally, limb spreading, sometimes with purplish-gray veins abaxially, adaxially white or ivory, stellate, 2–5 cm diam., lobes triangular to deltate, acute;

stamens inserted in upper part of tube just below mouth, included;

filaments unequal, free for at least some of their length (anthers not sessile),four 0.1–0.8 cm (2 of these slightly longer), 1 shorter, ca. 0.1 cm, glabrous;

style straight, just exceeding stamens, exserted from corolla mouth.

not tearing at scarious sinuses, nearly covering capsule, lobe tips spreading.

ovoid, 1.1–1.6 cm.

0.5 mm.

leaves sessile;

blade elliptic to oblanceolate, 10–30(–50) cm, base narrowed and winged, surfaces coarsely viscid-pubescent.

= 20.