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With plate 55The senior author, during the past two years, has made an extensive study of Yucca and related genera.These genera have been collected from western Texas, New Mexico, Arizona, and the southern areas in California, Nevada, Utah and Colorado.The distance covered in this area has approximated 25,000 miles, and no day of travel passed with-Mckelvey, Susan Delano and Sax, Karl.1933."Taxonomic and cytological
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Mckelvey et al. (1933) studied this question.
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