Mammoth basil is a lettuce leaf basil variety, originating from Italy. Like many culinary basils, it is a cultivar of Ocimum basilicum (sweet basil). The plant grows to approximately 18 inches tall, and produces large ruffled leaves with a jagged edge. The flavor is similar to, but stronger than the flavor of Genovese basil. The leaves are used in pesto or whole, in salads.
References
Mammoth basil Wikipedia(Text) CC BY-SA