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References

For Helenium

Bierner, M.W. 1972. Taxonomy of Helenium sect. Tetrodus and a conspectus of North American Helenium (Compositae). Brittonia 24: 331-355.

Bierner, M.W. 1989. Taxonomy of Helenium sect. Amarum (Asteraceae). Sida 13: 453-459.

Bierner, M.W. 2006b. Helenium. In Flora of North America Editorial Committee. 2006c. Flora of North America north of Mexico. Volume 21, Magnoliophyta: Asteridae, part 6: Asteraceae, part 3. Oxford Univ. Press, New York, NY. 616 pp.

Cronquist, A. 1980. Asteraceae, Volume I, Vascular flora of the Southeastern United States. University of North Carolina Press, Chapel Hill, N.C.

Fernald, M.L. 1943. Virginian botanizing under restrictions. Rhodora 45: 357-511 (pagination interrupted).

Knox, J.S. 1987. An experimental garden test of characters used to distinguish Helenium virginicum Blake from H. autumnale L. Castanea 52: 52-58.

Knox, J.S., K. Bezold, P.R. Cabe, S. Williams, and M.C. Simurda. 2016. Genetic diversity and population structure of the endemic disjunct species, Helenium virginicum (Asteraceae). Amer. Midland Naturalist 175 242-260.

Rock, H.F.L. 1957. A revision of the vernal species of Helenium (Compositae). Rhodora 59: 101-116, 128-159, 168-178, 203-216.

Rydberg, P.A. 1915. Carduales. Carduaceae. Heleniae, Tageteae. North American Flora 34, Part 2: 81-180.

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