Nicotiana longiflora
Nicotiana glauca
long-flower tobacco
tree tobacco
single or with few spreading lateral branches, 5–8(–10) dm, sparsely pubescent, usually not viscid, tuberculate.
usually branched near base, occasionally with distinct trunk (branches drooping), 10–60(–100) dm, glabrous, somewhat glaucous.
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.
petiole length 1/2 blade (not winged);
blade ovate to lanceolate, 5–25 cm, base acute or cordate, apex rounded, (rubbery), surfaces glabrous, glaucous.
false racemes, occasionally with few weak branches, not leafy; flowering crepuscular.
branched, not leafy; flowering diurnal.
0.5–1.3 cm.
0.3–1 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.
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.
not tearing at scarious sinuses, nearly covering capsule, lobe tips spreading.
not tearing along sinuses, covering mature capsule.
ovoid, 1.1–1.6 cm.
ovoid, 0.7–1.5 cm.
0.5 mm.
0.5 mm.
leaves sessile;
blade elliptic to oblanceolate, 10–30(–50) cm, base narrowed and winged, surfaces coarsely viscid-pubescent.
trees or shrubs.
= 20.
= 24.
Nicotiana longiflora
Nicotiana glauca
Nicotiana longiflora is a relatively rare weed along rivers and in waste places. It could be confused with N. plumbaginifolia, with which it is sympatric along the Gulf Coast, but differs from that species in its much larger flowers and its strongly 10-ribbed calyx. In a vegetative state, the two species are very difficult to distinguish.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Nicotiana glauca is registered as an invasive plant in the United States (www.invasives.org). It can form monodominant stands due to high seed set and germination success. It was originally introduced from Argentina to Mexico, thence to the United States and worldwide (T. H. Goodspeed 1954). Siphaulax glabra Rafinesque is an illegitimate, superfluous name for this species.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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