Older version of Localities documented in Tropicos sources

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Cirsium virginense S.L. Welsh:
United States (North America)

Hartman, R. L. & B. E. Nelson. 1998. Novelties from North America north of Mexico: A 20-Year Vascular plant Diversity Baseline. 1–51 (mss.). http://www.tropicos.org/Reference/11044
Welsh, S. L. 1982. New taxa of thistles (Cirsium: Asteraceae) in Utah. Great Basin Naturalist 42: 199–202. http://www.tropicos.org/Reference/18192