The Algorithmic Beauty of Plants (1990)
This is one of the trio of great books that Springer Verlag produced around the same time. The other two are <i>The Science of Fractal Images</i> and <i>Beauty of Fractals</i>.<p><a href="https://www.springer.com/gp/book/9781461283492" rel="nofollow">https://www.springer.com/gp/book/9781461283492</a><p><a href="https://www.springer.com/gp/book/9783540158516" rel="nofollow">https://www.springer.com/gp/book/9783540158516</a><p>Two other books that I think are good (but which are for general audiences) are AK Dewdney's <i>Magic Machine</i> which has a chapter about L Systems: <a href="https://www.amazon.com/Magic-Machine-Handbook-Computer-Sorcery/dp/0716721252" rel="nofollow">https://www.amazon.com/Magic-Machine-Handbook-Computer-Sorce...</a><p>And <i>Computers, Pattern, Chaos, and Beauty</i> by Clifford Pickover: <a href="https://www.amazon.com/Computers-Pattern-Beauty-Clifford-Pickover-ebook/dp/B00A73FHAS/" rel="nofollow">https://www.amazon.com/Computers-Pattern-Beauty-Clifford-Pic...</a>