Tribe Heliantheae Rank Species | ||
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Similar Silphium mohrii, Krigia biflora, Hypericum dolabriforme, Silphium asteriscus, Helenium flexuosum | ||
Silphium pinnatifidum top 5 facts
Silphium pinnatifidum, the tansy rosinweed or cutleaf prairie dock, is a species of flowering plant in the Composite family. It is native to the Southeastern United States where it is found in Alabama, Georgia, Kentucky, and Tennessee. Its habitat is prairies, barrens, and cedar glades.
Because of loss of its fire-dependent habitat, this species is uncommon and is considered vulnerable.
Although most populations are distinct, intermediate populations have been reported between Silphium pinnatifidum and Silphium terebinthinaceum, and some botanists consider S. pinnatifidum only a variety of S. terebinthinaceum. S. pinnatifidum was once thought to be a result of hybridization between Silphium terebinthinaceum and Silphium laciniatum, although molecular studies have indicated that S. pinnatifidum is too closely allied to S. terebinthinaceum for this to be the case.