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Heliopsis helianthoides subsp. occidentalis T.R. Fisher
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Flora of North America Editorial Committee. 2006. Magnoliophyta: Asteridae, part 8: Asteraceae, part 3. 21: i–xxii, 1–616. In Fl. N. Amer.. Oxford University Press, New York.
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Heliopsis helianthoides var. occidentalis (T.R. Fisher) Steyerm.
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Flora of North America Editorial Committee. 2006. Magnoliophyta: Asteridae, part 8: Asteraceae, part 3. 21: i–xxii, 1–616. In Fl. N. Amer.. Oxford University Press, New York.
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Heliopsis scabra Dunal
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Flora of North America Editorial Committee. 2006. Magnoliophyta: Asteridae, part 8: Asteraceae, part 3. 21: i–xxii, 1–616. In Fl. N. Amer.. Oxford University Press, New York.
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