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Nicotiana

1. Mid-stem leaves petioled (petioles winged in N. tabacum); flowers in a paniculate inflorescence.

2. Primary leaves with petioles wingless, not decurrent on the stem; tube of corolla ca. 1020 mm long.

N. rustica

2. Primary leaves with petioles winged, ± decurrent on the stem; tube of corolla ca. 3050 mm long

N. tabacum

1. Mid-stem leaves sessile, ± clasping and short-decurrent; flowers in a racemose inflorescence

N. alata

All species found in Nicotiana

Nicotiana alataJASMINE TOBACCO 
Nicotiana rusticaWILD TOBACCO 
Nicotiana tabacumCULTIVATED TOBACCO 

Citation:

MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. May 25, 2017. http://michiganflora.net/genus.aspx?id=Nicotiana.