North American Species of Cactus

In the fall of 1890 Dr. George Vasey, then Botanist of the Department of Agriculture, arranged with me to prepare a revision of North American Cactaceae. Owing to the peculiar difficulty of preserving material the family was poorly represented, even in our leading herbaria. To secure a large amount of additional material in the way of specimens and field notes the Department authorized me to visit the region of the Mexican boundary during the summer of 1891.

שנה

2005

שפה

English

הוצאה

eBooksLib

מהדורות

1

ISBN

9781554499243

מקור הנתונים: Wikidata