perfoliate : Idioms & Phrases
connate-perfoliate
Con"nate-per*fo"li*ate adjective
Definitions
(Bot.) Connate or coalescent at the base so as to produce a broad foliaceous body through the center of which the stem passes; -- applied to leaves, as the leaves of the boneset.
Webster 1913
perfoliate leaf
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noun a leaf with the base united around--and apparently pierced by--the stem