Aristid Lindenmayer was not a mathematician, but plant biologist, who created a system of notation in 1968 as a formal model of plant growth.
It has proven to be a remarkably diverse tool for exploring many simple fractal models and it has been adopted as a convenient notation for plant models, recreating many of the early curves, as well as being a rich vein for exploring new fractal curves.

For further study of Lindenmayer systems try the following links:

• The Fractint L-system Tutorial
• Lauren Lapre's L-Parser 3D L-system program
• C.J.van der Mark's L-Parser Tutorial Page