Rudbeckia columnifera Nutt.
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Dmitry Oreshkin
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Как-то мутно с авторством этой комбинации. В IPNI - пара Rudbeckia columnifera Nutt. и Ratibida columnifera (Nutt.) Wooton & Standl. В GBIF - Rudbeckia columnifera Nutt., Rudbeckia columnifera (Nutt.) Wooten & Standl. и Ratibida columnifera Wooton & Standl.
Aleksandr Ebel
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Судя по этому примечанию, должно быть Rudbeckia columnifera Nutt.
Dmitry Oreshkin
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Спасибо!
 
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