Nicotiana attenuata |
Nicotiana |
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coyote tobacco, wild tobacco |
tobacco |
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Habit | Herbs, annual, robust, from basal rosette. | Herbs, shrubs, or small trees, with soft wood, annual, biennial, or short-lived perennial, often rosette-forming, from taproot or rarely horizontal rootstock (forming colonies), sparsely to densely viscid-pubescent with simple hairs, rarely glabrous. | ||||||||||||||||||||||||||||||||||||||||||||||||
Stems | single or with few weak lateral branches, 5–20 dm, viscid-pubescent or glabrate with few hairs with swollen bases. |
usually erect, sometimes branching from base. |
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Leaves | alternate, densely clustered in rosette-forming species, sessile or petiolate; petiole often winged; blade simple, margins entire or irregularly and obscurely crenate and sometimes undulate. |
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Cauline leaves | petiole length to 1/2 blade, distal leaves sessile; blade lanceolate to linear, progressively narrower distally, 2–8(–10.5) cm, apex acute to acuminate, surfaces viscid-pubescent or glabrate. |
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Inflorescences | unbranched or with few short lateral branches, somewhat leafy; flowering crepuscular (early morning). |
terminal or apparently axillary, cymose, usually forming false racemes, or glomerulate. |
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Pedicels | 0.2–0.4 cm. |
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Flowers | calyx uniformly green or with weakly developed veins, 0.6–1 cm, densely viscid-pubescent (hairs with swollen bases), lobes narrowly triangular, shorter than tube, unequal; corolla straight, 2–3.5 cm (excluding limb), viscid-puberulent externally, tube creamy white or tinged with purple-green or gray-green, 0.5–0.7 cm × 1.5–2 mm, widening to throat 2–3 × 5 mm (asymmetrically dilated distally), glabrous or minutely puberulent within, limb spreading or slightly reflexed, white or cream, pentagonal to ± circular and often asymmetrically spreading, 0.4–0.8 cm diam., lobes shallow and rounded or obtuse, broadly triangular (proximal lobes reflexed); stamens inserted near base of throat, included; filaments unequal, 4 of 3 cm (2 of these slightly longer), 1 shorter, 1.5–2 cm, glabrous or minutely pubescent proximally; style straight, just shorter than longest stamen pair. |
bisexual, 5-merous (fasciated with increased parts only in cultivars), radially symmetric or somewhat bilaterally symmetric, especially in androecium; calyx tubular or narrowly campanulate, 5-lobed, lobes persistent, usually deltate or triangular, equal or unequal, usually slightly accrescent and mostly enclosing capsule; corolla white to cream, variously marked or tinged with pink or purple, or yellow-green, radial or more commonly at least somewhat bilateral, tubular, funnelform, or salverform, limb deeply 5-lobed to ± entire, lobes, if present, rounded to deltate, sometimes emarginate; stamens 5, inserted variously from near base of corolla tube to near apex, sometimes unequal (2 + 2 + 1), on equal filaments or filaments of unequal length with one inserted at a different level and usually shorter than the other 4; anthers dorsifixed (or appearing basifixed), ellipsoid to globose, dehiscing by longitudinal slits; ovary 2-carpellate (irregularly more in some cultivars); style filiform, straight or curved; stigma capitate or slightly 2-lobed. |
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Fruiting calyces | not tearing at sinuses, covering to 1/2 of mature capsule. |
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Fruits | capsules, usually ovoid, sometimes narrowly so, 2–4-valved (occasionally many-valved in cultivars), dehiscent apically with long septicidal cleft and shorter loculicidal cleft. |
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Capsules | ovoid, 0.8–1.2 cm. |
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Seeds | 0.8 mm. |
angular to oblong (minute), occasionally somewhat reniform. |
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Rosette | leaves: petiole length shorter than or almost equaling blade (2–3 cm); blade elliptic or oblong-elliptic, 5–10 cm, surfaces viscid-pubescent. |
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x | = (9, 10), 12, (16, 18, 19), 24. |
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2n | = 24. |
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Nicotiana attenuata |
Nicotiana |
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Phenology | Flowering May–Nov. | |||||||||||||||||||||||||||||||||||||||||||||||||
Habitat | Sandy slopes, banks and rocky outcrops, disturbed places, often appearing after fire. | |||||||||||||||||||||||||||||||||||||||||||||||||
Elevation | (50–)1000–2600 m. ((200–)3300–8500 ft.) | |||||||||||||||||||||||||||||||||||||||||||||||||
Distribution |
AZ; CA; CO; ID; MT; NM; NV; OR; TX; UT; WA; WY; BC; Mexico (Baja California, Sinaloa, Sonora)
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North America; Mexico; Central America; South America; West Indies; s Africa; Australia [Introduced widely] |
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Discussion | Nicotiana attenuata is the most common species of the genus in the Great Basin, and often forms large colonies after fires and other disturbance. It has been the subject of intensive study over many years by the Max Planck Institute for Chemical Ecology at the Lytle Ranch Preserve in southwestern Utah (for example, C. Diezel et al. 2011; D. Kessler et al. 2015). There are some records of its use by Native American peoples as a smoking or chewing tobacco; it has also been reported as a medicinal plant used by the Zuni people (M. C. Stevenson 1915). Nicotiana torreyana A. Nelson & J. F. Macbride is an illegitimate name that has been applied to this species. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Species ca. 75 (12 in the flora). Nicotiana is recognizable by its tubular flowers and usually sticky pubescence. Of the species occurring in North America, only N. glauca is not sticky-pubescent. The genus has long been of interest due the high number of allopolyploid species (T. H. Goodspeed 1954; M. W. Chase et al. 2003; E. W. McCarthy et al. 2015). Most species of Nicotiana in the flora area have distinct basal rosettes until flowering occurs, and cauline leaves usually differ in morphology from those in the basal rosette. Many species occur as short-lived perennials in areas without frost, but occur as annuals where winters are harder. The tree tobacco (N. glauca) is the only truly woody species occurring in North America. Species of Nicotiana that bloom in the evening usually have white or cream flowers and are pollinated by moths, while day-flowering species have yellow, pink, or cream flowers and are pollinated by bees; however, this overall pattern does not hold strictly true. Nicotiana attenuata has become a model system for the study of the complex interplay between pollinators and herbivores in the evolution of floral and other traits (for example, C. Diezel et al. 2011; D. Kessler et al. 2015). Nicotiana species are often cultivated and occur occasionally as garden or greenhouse escapes. Nicotiana alata Link & Otto and N. × sanderae W. Watson have been reported for the flora area but are known only as ephemerals or from cultivation. Some records of N. alata are possible misidentifications for N. longiflora, from which N. alata differs in its strongly decurrent cauline leaves and larger corollas with wider tubes. Nicotiana × sanderae has striking red salverform corollas; various horticultural hybrids of this long-flowered species are possible ephemeral occurrences on waste heaps. The two tobaccos of commerce, Nicotiana rustica and N. tabacum, are cultivated as ornamentals or as sources of leaves for human use. Although most herbarium specimens from the flora area are clearly from cultivation, both taxa are sometimes adventive. The small seeds and weedy habits of Nicotiana species predispose them to become invasive; for example, the non-native species N. glauca is a common component of ecosystems in western North America. This propensity to grow in disturbed areas means cultivated species are likely to become established briefly in areas where soil is loose or in old garden sites. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 14. | FNA vol. 14. | ||||||||||||||||||||||||||||||||||||||||||||||||
Parent taxa | Solanaceae > Nicotiana | Solanaceae | ||||||||||||||||||||||||||||||||||||||||||||||||
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Name authority | Torrey ex S. Watson: Botany (Fortieth Parallel), 276, plate 27, figs. 1, 2. (1871) | Linnaeus: Sp. Pl. 1: 180. (1753): Gen. Pl. ed. 5, 84. (1754) | ||||||||||||||||||||||||||||||||||||||||||||||||
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