African Blue basil
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African Blue basil is one of the most cold-tolerant breeds of basil, leading to it being called a perennial, though in fact all basils are perennial as long as the weather is warm year-round. Unfortunately, it's also a sterile hybrid of two other breeds of basil, unable to produce seeds of its own.
This particular breed of basil has a strong camphor scent, derived from actual camphor, itself. It also has leaves which start out purple when young, only growing green as the given leaf grows to its full size, and even then retaining purple veins. This breed is also taller than many basil cultivars.
See also: List of basil cultivars