Silphium gracile A. Gray. Simpson Rosinweed, Slender Rosinweed. Phen: Jun-Jul. Hab: Prairies. Dist: LA and e. TX.
Origin/Endemic status: Endemic
Synonymy: = NcTx; = Silphium radula Nutt. var. gracile (A.Gray) Clevinger – FNA21, K3, K4; > Silphium gracile A.Gray – Tx, Perry (1937); > Silphium simpsonii Greene var. wrightii L.M.Perry – Tx, Perry (1937)
Heliophily: 9
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