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Sweet Basil is an erect annual, up to 35 cm in height, with ovate, toothed or entire, leaves which are up to 8 cm in length. The flowers are white or purple-tinged, around 1 cm long, and borne in simple terminal racemes. Some varieties have partly red or entirely purple leaves.
(Vaughan and Geissler 1997)
A great diversity of Sweet Basil varieties have been developed (see Simon et al.1999). Several aroma compounds can be found in different chemotypes of basil, including citral, eugenol, linalool, methylchavicol, and methyl cinnamate and are traded in the international essential oil market. These chemotypes are commonly known by names based on geographical origins such as Egyptian, French, European, or Reunion basil. The European type, a sweet basil, contains linalool and methylchavicol as the major constituents. The Egyptian basil is very similar to the European, but contains a higher percentage of methylchavicol. The Reunion type, from the Comoro Islands, and more recently from Madagascar, Thailand, and Vietnam, is characterized by high concentrations of methylchavicol. Methyl cinnamate-rich basil has been commercially produced in Bulgaria, India, Guatemala, and Pakistan. A basil from Java, Russia, and North Africa is rich in eugenol.
Simon et al. (1999) note that the diversity in basil based on appearance; flavors; fragrances; industrial, edible, and drying oils; and natural pigments provides great opportunities for developing new culinary, ornamental, and industrial crops. They also suggest that the high variation among basil cultivars in susceptibility to damage by Japanese beetles suggests the presence of active ingredients that either could be useful in commercial traps or serve as a deterrent.
Simon et al. (1999)
University of Vermont Extension provides links to a number of useful sources on Basil production.