The edge or border of a leaf blade. Leaf margins can have various shapes and patterns, including smooth, toothed, lobed, or wavy edges, and are important features for plant identification.
From Latin 'margo' meaning 'border' or 'edge,' combined with 'leaf.' The term became standard in botanical descriptions during the development of formal plant taxonomy in the 18th and 19th centuries.
Leaf margins aren't just decorative - they're functional! Serrated edges can help break up airflow to reduce water loss, while smooth margins are often found on plants in moist environments where water conservation isn't critical.
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