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The area between the two lobes of this Cyclamen persicum leaf is a sinus.

In botany, a sinus is a space or indentation between two lobes or teeth, usually on a leaf. [1] The term is also used in mycology. For example, one of the defining characteristics of North American species in the Morchella elata clade of morels is the presence of a sinus where the cap attaches to the stipe. [2]

See also


  1. ^ Hickey, M.; King, C. (2001). The Cambridge Illustrated Glossary of Botanical Terms. Cambridge University Press.
  2. ^ Kuo M, Dewsbury DR, O'Donnell K, Carter MC, Rehner SA, Moore JD, Moncalvo J-M, Canfield SA, Stephenson SL, Methven AS, Volk TJ (2012). "Taxonomic revision of true morels (Morchella) in Canada and the United States". Mycologia. 104 (5): 1159–77. doi: 10.3852/11-375. PMID  22495449. S2CID  45219627.