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Morfología y anatomía foliar de los géneros del complejo Milla (Themidaceae)Foliar morphology and anatomy of genera in the Milla complex (Themidaceae)

The enclosed areole meristem and internal bud development are understood to be an adaptation to protect the meristem and the bud from low temperatures. The anatomical evidence supports the hypothesis that the enclosed bud represents one synapomorphy for Echinocereus and also supports the exclusion of Morangaya from Echinocereus.