Nicotiana longiflora |
Nicotiana obtusifolia |
|
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long-flower tobacco |
desert tobacco |
|
Habit | Herbs, annual or biennial, from basal rosette. | Herbs, annual or short-lived perennial, without marked basal rosette. |
Stems | single or with few spreading lateral branches, 5–8(–10) dm, sparsely pubescent, usually not viscid, tuberculate. |
branched from base, (slender, brittle), 5–10 dm, viscid-tomentose. |
Cauline leaves | 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 short and winged or leaves sessile; proximal blades oblanceolate to narrowly elliptic, distal blades panduriform to trigonate, 5–20 cm, smaller very near inflorescence, base somewhat clasping, apex acute or acuminate, surfaces densely viscid-pubescent. |
Inflorescences | false racemes, occasionally with few weak branches, not leafy; flowering crepuscular. |
secund false racemes, occasionally few-branched, somewhat leafy; flowering diurnal. |
Pedicels | 0.5–1.3 cm. |
0.2–0.5 cm. |
Flowers | 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, cup-shaped, 10-ribbed, 0.8–2 cm, with minute membranous sinuses, pubescent and somewhat rough, lobes triangular to long-triangular, ± unequal, as long or longer than tube, tips slightly recurved; corolla straight, 1.2–3.5 cm (excluding limb), viscid-pubescent externally, tube gray-green, cream, or ± yellowish cream, 0.3–0.6 cm × 2–4 mm, widening to throat 6–12 × 5 mm, glabrous or minutely puberulent within, limb slightly reflexed to spreading, cream or whitish green, pentagonal, 0.6–8 cm diam., lobes broadly triangular and rounded apically, equal; stamens inserted at base of throat, included; filaments unequal, 4 straight, 1.2–3.4 cm, sometimes kneed, extending to corolla mouth, 1 shorter, 1–2 cm, not kneed, curved away from corolla, all slightly pubescent just above insertion point; style straight, just exceeding longest stamens. |
Fruiting calyces | not tearing at scarious sinuses, nearly covering capsule, lobe tips spreading. |
not tearing at sinuses, covering lower 2/3 of capsule. |
Capsules | ovoid, 1.1–1.6 cm. |
broadly ovoid (acute), 0.8–1.1 cm. |
Seeds | 0.5 mm. |
0.5 mm. |
Rosette | leaves sessile; blade elliptic to oblanceolate, 10–30(–50) cm, base narrowed and winged, surfaces coarsely viscid-pubescent. |
|
2n | = 20. |
= 24. |
Nicotiana longiflora |
Nicotiana obtusifolia |
|
Phenology | Flowering Apr–Aug. | Flowering year-round. |
Habitat | Open fields, stream banks, wet places, ballast sites near ports. | Rocky or gravelly areas in deserts. |
Elevation | 0–200 m. (0–700 ft.) | 0–2500(–2900) m. (0–8200(–9500) ft.) |
Distribution |
AL; FL; GA; IL; IN; LA; MA; MO; MS; TX; WV; ON; QC; South America (Argentina, Bolivia, Paraguay) [Introduced in North America; introduced also in Europe (Germany, Sweden), Africa (South Africa)] |
AZ; CA; NM; NV; OK; TX; UT; Mexico
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Discussion | 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.) |
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Source | FNA vol. 14. | FNA vol. 14. |
Parent taxa | Solanaceae > Nicotiana | Solanaceae > Nicotiana |
Sibling taxa | ||
Synonyms | N. acuta, N. acutiflora | N. glandulosa, N. multiflora, N. palmeri, N. trigonophylla |
Name authority | Cavanilles: Descr. Pl., 106. (1802) | M. Martens & Galeotti: Bull. Acad. Roy. Soc. Bruxelles 12(1): 129. (1845) |
Web links |