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Term Definition
Perfoliate Referring to a stem that penetrates two leaf bases that are completely fused together. When two leaf bases wrap around the stem the leaf is said to be amplexicaulous or clasping. Decussate leaves and perfoliate stem. Photo by C. A. Gracie.
Perfoliate Referring to a stem that with two leaf bases that are completely fused together, i.e., the leaves look as if their bases grew through the leaves. Decussate and perfoliate leaves of Eupatorium perfoliatum. Photo by C. A. Gracie.