Tobacco Nicotiana tabacum
Geologic period: Modern
Parts of Nicotiana tabacum, the tobacco plant
About this image:
Cultivation of tobacco often produces three types of leaves on the tobacco plant: Bottom leaves which may be large but which receive less sun; middle leaves which are usually the largest and which are typically milder in flavor; and the top leaves which are the smallest but which also receive the most sunlight, producing the most nicotine and the strongest flavor.