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19. Nicotiana Linnaeus, Sp. Pl. 1: 180. 1753.
烟草属 yan cao shu
Herbs, shrubs, or small trees; pubescence of simple and glandular hairs. Leaves petiolate or sessile, entire or subentire. Inflorescences paniculate, racemose, or reduced to solitary flowers; peduncle mostly erect; bracts mostly present. Flowers sometimes showy, mostly fragrant, zygomorphic, 4- or 5-merous, pedicellate. Calyx regular or irregular, tubular or tubular-campanulate, lobed. Corolla tubular, funnelform, or salverform; tube lobed to subentire. Stamens inserted below middle of corolla tube; filaments slender; anthers dehiscing longitudinally. Disc ringlike, nectariferous. Ovary 2-locular. Stigma 2-lobed. Fruiting calyx persistent, slightly inflated, partially or completely enveloping fruit. Fruit a dry capsule dehiscing by apical valves. Seeds numerous, minute; embryo erect or slightly bent; cotyledons linear.
About 95 species: Africa, Americas, Australia, and Oceania; three species are cultivated in China as drug plants or as ornamentals, at least one is naturalized.
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| 1 |
Shrubs glabrescent; leaves glaucous, subleathery, slender petiolate; corolla glabrous; filaments glabrous, subequal |
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1 Nicotiana glauca |
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Herbs glandular hairy; leaves membranous, often winging stem; corolla puberulent adaxially; filaments pubescent at base, 1 shorter than others. |
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(2) |
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| 2 (1) |
Petiole not winged; corolla tubular, greenish yellow, less than 2.5 cm; stamens included |
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2 Nicotiana rustica |
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Petiole winged or leaves subsessile; corolla funnelform, pink or pale green, more than 3 cm; stamens exserted |
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3 Nicotiana tabacum |
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Lower Taxa
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Treatments in Other Floras @ www.efloras.org
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