Paulus roetter (1806 - 1894)
Click Images to Enlarge
Botanical Plates from The Report on the United States and Mexican Boundary Survey
Vol. II “Botany of the Boundary. Cactaceae" by George Engelmann, M.D.
Botanical Plates from Explorations and Surveys for a Railroad Route from the Mississippi River to the Pacific Ocean
Vol. IV - Whipple Survey of the Route Near the 35th Parallel
"Report on the Botany of the Expedition. No. 3 Description of the Cactaceae" by George Engelmann, M.D.
All images courtesy of Cactuspro www.cactuspro.com/biblio