North American Species of Cactus

中文名：
北美仙人掌
作者：
约翰·M·库尔特 John M. Coulter
类型：
生物科学
文档信息：
329 KB pdf格式
添加日期：
2009-10-16
解压密码：
www.qcenglish.com [点击复制]
收藏和分享北美仙人掌：
北美仙人掌(North American Species of Cactus)简介：
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.

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