Abstract
The nodal anatomy of 42 species belonging to 22 genera of Lamiaceae has been investigated. Two types of nodal configurations (1) unilacunar one-traced; (2) unilacunar two-traced have been reported. It is suggested that the unilacunar two-traced condition in this family is primitive and unilacunar one-traced condition has originated by approximation. This evidence has come from the unique nodal anatomy ofClinopodium umborosum where one leaf gets a single trace whereas the opposite leaf receives two traces. Variations in nodal pattern have been observed within the same species ofClinopodium umbrosum and in the different species ofMentha. Thus, Sinnott’s view that a major taxon has a specific type of nodal configuration does not have much significance in this family.
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Gupta, M.L., Bhambie, S. Studies in Lamiaceae I. The node. Proc. Indian Acad. Sci. 86, 281–286 (1977). https://doi.org/10.1007/BF03050951
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DOI: https://doi.org/10.1007/BF03050951