He travelled extensively through Central and South America, and published a number of books on cacti, including the six-volume, 4,000-page Die Cactaceae, 1958-1962, and the Kakteenlexikon, first appearing in 1966 and updated posthumously.
Although he collected and described many new species and defined a number of new genera, much of his work was based on faulty assumptions about the evolution of cacti and was too focused on geographic distribution; many of his genera have since been reorganized or abandoned. The botanist David Hunt is quoted as saying that he "left a trail of nomenclatural chaos that will probably vex cactus taxonomists for centuries." Nevertheless, his observations regarding the subtle variations among cacti have proven useful for hobbyists, who continue to use many cactus names proposed or upheld in his works.
- Anderson, Edward F. (2001), The Cactus Family, Pentland, Oregon: Timber Press, ISBN 978-0-88192-498-5, p. 98
- IPNI. Backeb.
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