Vegetation of Northwest Mexico 
[11 
Hayek, August. Allgemeine Pflanzengeographie, 1926. 
Campbell, D. N. Outline of Plant Geography, 1926. 
Hansen, Adolph. Die Pflanzendecke der Erde, 1920. 
Hardy, Marcel. The Geography of Plants, 1920. 
Schimper, A. F. W. Plant Geography , 1903. 
Drude, Oscar. Handbuch der Pflanzengeographie, 1890. 
Monographs on families, genera, and species normally 
stress the floristic rather than vegetational aspects of the 
subject. Nevertheless, valuable data on areal distribution 
and ecology can be gleaned from many of these works. De¬ 
serving special mention in Die Pfla?izenareale series edited 
by Diels, Samuelsson, Hannig, and Windier, and published 
at Jena since 1926. This serial is devoted to articles and 
maps developing the areal distribution of plants over the 
earth. The principal monographs consulted are listed below: 
Bailey, L. H. Gentes Herbarium, various numbers. 
Bailey, L. H. Standard Cyclopedia of Horticulture, 1914, 
\ various articles. 
Baker, J. C. Handbook of the Amaryllideae , 1888. 
Berger, B. Die Agawen, 1915. 
Britton and Rose. The Genus Cereus and Its Allies in North 
America, 1909. 
Britton and Rose. The Cactaceae, 1920. 
Die Pflanzenareale: 
Shreve, Fouquieraceae, 1931. 
Shreve, Larrea tridentata, 1931. 
Shreve, Camegia gigantea, 1931. 
Diguet, Leon. Les Cactacees Utiles du Mexique, 1928. 
Engler, Adolph. Das Pflanzenreich, various numbers. 
Hall, H., and Clemens, F. The North American Species of 
Artemisia, Chrysothamus and Atriplex, 1923. 
Hitchcock, A. S. Mexican Grasses in the U. S. Nat. Mus. 
Herbarium, 1913. 
Karsten, G. and Schenck, H., Vegetationsbilder: 
Karsten and Stahl, Mexikanische kakteen, 1903. 
Karsten, Die Mangrove Vegetation, 1905. 
Stahl, Mexikanische Nadelholzer, 1905. 
Stahl, Nordmexikanische Xerophyten, 1905. 
Purpus, Arizona Wustengebiet, 1907. 
Missouri Botanical Garden, Annual Reports, vols. 3, 4, 7, 12, 
13 18, and 22. Various articles on Agaves, Yucceae , 
Yuglandaceae by Trelease, Mulford, and Riley. 
