Nicotiana longiflora
Nicotiana acuminata
long-flower tobacco
many-flower tobacco, manyflower
single or with few spreading lateral branches, 5–8(–10) dm, sparsely pubescent, usually not viscid, tuberculate.
branched from base (proximal branches longer), 5–20 dm, viscid-pubescent.
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 1/3–1/6 blade;
blade elliptic to lanceolate, becoming very narrow near inflorescence, 10–25 cm, apex acuminate, surfaces viscid-pubescent, somewhat scabrous adaxially.
false racemes, occasionally with few weak branches, not leafy; flowering crepuscular.
few-branched, somewhat leafy; flowering crepuscular.
0.5–1.3 cm.
0.5–2 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 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.
not tearing at scarious sinuses, nearly covering capsule, lobe tips spreading.
tearing along membranous sinuses, covering ca. 1/2 of mature capsule.
ovoid, 1.1–1.6 cm.
broadly ovoid, 1–1.2 cm.
0.5 mm.
0.9–1 mm.
leaves sessile;
blade elliptic to oblanceolate, 10–30(–50) cm, base narrowed and winged, surfaces coarsely viscid-pubescent.
leaves: petiole length equaling blade;
blade ovate or orbiculate, 6–12 cm, surfaces viscid-pubescent, somewhat scabrous adaxially.
= 20.
= 24.
Nicotiana longiflora
Nicotiana acuminata
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 acuminata is native to Chile and is naturalized on the West Coast from Baja California to Washington. It is easy to confuse with the native N. attenuata but differs in its much longer corolla tube and usually emarginate limb. The flowers are often clustered near the tips of the few inflorescence branches. Plants from the western United States are often identified as var. multiflora.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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