BAILEY, I. W. Comparative Anatomy of the Leaf-Bearing Cactaceae, X. The Xylem of Pereskia Colombiana, Pereskia Guamacho, Pereskia Cubensis, and Pereskia Portulacifolia. Reykjavík 1963. Pp. 390-396 + V plates. Staple bound. Reprint from Journal of the Arnold Arboretum. Volume XLIV, No. 3.
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