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Jennifer A. Clevinger +
Nuttall +
Roughleaf rosinweed +
sc United States. +
Trans. Amer. Philos. Soc., n. s. +
Undefined (tribe Undefined) subtribe Enceliinae +, Undefined (tribe Undefined) subtribe Engelmanniinae +, Undefined (tribe Undefined) subtribe Spilanthinae +, Undefined (tribe Undefined) subtribe Verbesininae +  and Undefined (tribe Undefined) subtribe Zinniinae +
Silphium radula +
Silphium +
species +