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Silphium perplexum J.R. Allison. Old Cahaba Rosinweed. Hab: Dolomitic glades and woodlands. Dist: Endemic to c. AL (Allison & Stevens 2001).

Origin/Endemic status: Endemic

Synonymy : = FNA21, K4; = Silphium ×perplexum – K2, pro species

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Heliophily : 9

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