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Petasites alaskanus Rydb.
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Flora of North America Editorial Committee. 2006. Magnoliophyta: Asteridae, part 7: Asteraceae, part 2. 20: i–xxii, 1–666. In Fl. N. Amer.. Oxford University Press, New York.
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Petasites corymbosus (R. Br.) Rydb.
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Flora of North America Editorial Committee. 2006. Magnoliophyta: Asteridae, part 7: Asteraceae, part 2. 20: i–xxii, 1–666. In Fl. N. Amer.. Oxford University Press, New York.
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Petasites frigidus var. hyperboreoides Hultén
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Flora of North America Editorial Committee. 2006. Magnoliophyta: Asteridae, part 7: Asteraceae, part 2. 20: i–xxii, 1–666. In Fl. N. Amer.. Oxford University Press, New York.
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Petasites frigidus var. nivalis (Greene) Cronquist
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Flora of North America Editorial Committee. 2006. Magnoliophyta: Asteridae, part 7: Asteraceae, part 2. 20: i–xxii, 1–666. In Fl. N. Amer.. Oxford University Press, New York.
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Petasites gracilis Britton
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Flora of North America Editorial Committee. 2006. Magnoliophyta: Asteridae, part 7: Asteraceae, part 2. 20: i–xxii, 1–666. In Fl. N. Amer.. Oxford University Press, New York.
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Petasites hyperboreus Rydb.
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Flora of North America Editorial Committee. 2006. Magnoliophyta: Asteridae, part 7: Asteraceae, part 2. 20: i–xxii, 1–666. In Fl. N. Amer.. Oxford University Press, New York.
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Petasites nivalis Greene
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Flora of North America Editorial Committee. 2006. Magnoliophyta: Asteridae, part 7: Asteraceae, part 2. 20: i–xxii, 1–666. In Fl. N. Amer.. Oxford University Press, New York.
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Petasites nivalis subsp. hyperboreus (Rydb.) J. Toman
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Flora of North America Editorial Committee. 2006. Magnoliophyta: Asteridae, part 7: Asteraceae, part 2. 20: i–xxii, 1–666. In Fl. N. Amer.. Oxford University Press, New York.
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