---
type: Fractal Concept
title: L-System
description: Parallel string-rewriting grammar (Lindenmayer system) used to model branching biological structures such as plants, algae, and trees.
resource: https://tyson-swetnam.github.io/fractal-notebooks/okf/concepts/generative/l-system/
tags:
- generative
- biological
- branching
aliases:
- l-systems
- lindenmayer system
sources:
- id: glossary
  resource: https://tyson-swetnam.github.io/fractal-notebooks/foundations/glossary/
  title: Fractal Notebooks glossary (Chapter 4)
- id: seed
  resource: https://github.com/tyson-swetnam/fractal-notebooks/blob/main/fractal_rag/src/fractal_rag/concepts/seed.yaml
  title: fractal_rag concept seed (seed.yaml)
generated:
  by: process:fractal-rag-okf-export
  at: "2026-10-24T00:00:00Z"
status: stable
---

# Definition

Parallel string-rewriting grammar (Lindenmayer system) used to model branching biological structures such as plants, algae, and trees.

# Aliases

`l-systems`, `lindenmayer system`

# Citations

[1] [Fractal Notebooks glossary (Chapter 4)](https://tyson-swetnam.github.io/fractal-notebooks/foundations/glossary/) — `docs/foundations/glossary.md`

[2] [fractal_rag concept seed (seed.yaml)](https://github.com/tyson-swetnam/fractal-notebooks/blob/main/fractal_rag/src/fractal_rag/concepts/seed.yaml) — `fractal_rag/src/fractal_rag/concepts/seed.yaml`