Eryngium aquaticum
Plants
Britton, N.L., and A. Brown. 1913. An illustrated flora of the northern United States, Canada and the British Possessions. 3 vols. Charles Scribner's Sons, New York. Vol. 2: 622. Courtesy of Kentucky Native Plant Society. Scanned by Omnitek Inc. · public_domain
About
Eryngium aquaticum is a species of flowering plant in the family Apiaceae known by the common name rattlesnakemaster, marsh rattlesnake master, corn-snakeroot, bitter snakeroot, and marsh eryngo. This plant is native to eastern North America.
Summary from Wikipedia
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Growing details and traits for Eryngium aquaticum in the Library.
No cultivars in the Library yet — the full profile above covers the species itself.