Achillea nigrescens
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Achillea nigrescens
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Andriy Kovalchuk
Протолог Achillea millefolium var. nigrescens E. Mey. (De Plantis Labradoricis. Libri tres: 65. 1830):
Andriy Kovalchuk
Обнародование комбинации Achillea nigrescens (E. Mey.) Rydb. (North American Flora 34(3): 221. 1916 [29 Dec 1916]):
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