There are many other varieties of basil now . These varieties vary in scent, form, color and flavor. Several are lemon-scented . Sweet Dani was introduced recently, and quickly became very popular lemon scented basil. Mrs. Burns is a large growing lemon basil.
Some basils have unique coloring.
I bought African Blue basil at an herb fair. It is tall with purple stems and veins in the green leaves. An interesting article by Adrienne Cook spoke about spicy Thai basil. Bright green leaves cover a tall slender one- foot stem. Basil is easy to grow in the summer.