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1 Plant an herb, 0.5-3 m tall; stems and leaf blades densely viscid-puberulent (or sparsely so to merely tuberculate in N. longiflora). | |
2 Corolla tube 1.2-1.7 cm long, greenish yellow, with limb 3-6 mm wide; leaves distinctly petiolate; [section Rusticae] | |
2 Corolla tube 2.5-12.0 cm long, cream, white, yellow, or pink, with limb 10-25 mm wide; leaves auriculate clasping. | |
3 Larger leaves on a plant 3.5-8 dm long; corolla tube 3.0-5.5 cm long, 4-7× as long as the average diameter, the limb 10-15 mm wide, pink or reddish (rarely white); [section Nicotiana] | |
3 Larger leaves on a plant 1-3 (-5) dm long; corolla tube 2.5-12.0 cm long, 10-50× as long as the average diameter, the limb 15-25 mm wide, white or lavender. | |
5 Corolla tube 4-12 cm long. | |
6 Corolla throat constricted; filaments unequal, stamens didynamous (2 different lengths); cauline leaf blades lanceolate or linear, leaves sessile, auriculate; [section Alatae] | |