Silphium Pinnatifidum on:
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''Silphium pinnatifidum'', the tansy rosinweed or cutleaf prairie dock, is a 
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 ''
Jessee, L.H. and G. Yatskievych. 2011. A new putative hybrid in Silphium (Asteraceae: Heliantheae). Phytoneuron 2011–62: 1–7.
species
In biology, a species is the basic unit of Taxonomy (biology), classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of ...
of flowering plant
Flowering plants are plants that bear flowers and fruits, and form the clade Angiospermae (), commonly called angiosperms. They include all forbs (flowering plants without a woody stem), grasses and grass-like plants, a vast majority of ...
in the family Asteraceae
The family Asteraceae, alternatively Compositae, consists of over 32,000 known species of flowering plants in over 1,900 genera within the order Asterales. Commonly referred to as the aster, daisy, composite, or sunflower family, Compositae ...
. It is native to the Southeastern United States
The Southeastern United States, also referred to as the American Southeast or simply the Southeast, is a geographical region of the United States. It is located broadly on the eastern portion of the southern United States and the southern po ...
where it is found in Alabama, Georgia, Kentucky, and Tennessee. Its habitat is prairies
Prairies are ecosystems considered part of the temperate grasslands, savannas, and shrublands biome by ecologists, based on similar temperate climates, moderate rainfall, and a composition of grasses, herbs, and shrubs, rather than trees, as th ...
, 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
''Silphium laciniatum'' is a species of flowering plant in the family Asteraceae known commonly as compassplant or compass plant. It is native to North America, where it occurs in Ontario in Canada and the eastern and central United States as fa ...
'', although molecular studies have indicated that ''S. pinnatifidum'' is too closely allied to ''S. terebinthinaceum'' for this to be the case.Jessee, L.H. and G. Yatskievych. 2011. A new putative hybrid in Silphium (Asteraceae: Heliantheae). Phytoneuron 2011–62: 1–7.
References
{{Taxonbar, from=Q16992572 Silphium (genus), pinnatifidum