Comparative anatomy of the leaves of Piper lepturum(Kunth) C.DC. var. lepturum and Piper lepturum var. angustifolium (C.DC.) Yunck. by Nelson Santana de Oliveira Machado, Flaviane Gomes Pereira, Paulo Roberto Dias dos Santos, Cecília Gonçalves Costa, Elsie Franklin Guimarães

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