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Botanical Nerd Word: Sinus

Sinus: The portion of a leaf margin that dips in between two lobes or crenations.*

The alternating sinuses and lobes around the margins of maple leaves give them their distinctive shape. Happy Canada Day!

*Pell, S.K., Angell, B. (2016). A botanist’s vocabulary: 1300 terms explained and illustrated. Portland: Timber Press.

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