Silphium pinnatifidum

Silphium pinnatifidum, the tansy rosinweed[2] 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.[3] Its habitat is prairies, barrens, and cedar glades.[4]

Note the large phyllaries often indicative of Silphium

Silphium pinnatifidum

Vulnerable  (NatureServe)[1]
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Asterales
Family: Asteraceae
Genus: Silphium
Species:
S. pinnatifidum
Binomial name
Silphium pinnatifidum
Elliott

Because of loss of its fire-dependent habitat, this species is uncommon and is considered vulnerable.[1][5]

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.[6]

References
  1. "Silphium pinnatifidum". NatureServe. Retrieved 2014-05-04.
  2. "Silphium pinnatifidum". Natural Resources Conservation Service PLANTS Database. USDA. Retrieved 15 November 2015.
  3. Flora of the Southern and Mid-Atlantic States
  4. Chester, Edward (2015). Guide to the Vascular Plants of Tennessee.
  5. U.S. Forest Service
  6. Jessee, L.H. and G. Yatskievych. 2011. A new putative hybrid in Silphium (Asteraceae: Heliantheae). Phytoneuron 2011–62: 1–7.
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