Isaac sprague (1811 - 1895)

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Botanical Plates by Isaac Sprague
Explorations and Surveys for a Railroad Route from the Mississippi River to the Pacific Ocean
Vol. II - Pope Survey of the Route Near the 32nd Parallel
Report on the Botany of the Expedition by John Torrey and Asa Gray


Botanical Plates by Isaac Sprague
United States Geographical Surveys West of the 100th Meridian
Vol. VI - Reports upon the Botanical Collections by J. T. Rothrock


Botanical plates by Isaac Sprague
Plantae Fremontianae by John Torrey, 1850


All images courtesy of the Missouri Botanical Garden www.botanicus.org