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Silphium pinnatifidum

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Silphium pinnatifidum

Vulnerable  (NatureServe)[1]
Scientific classification Edit this 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

Silphium pinnatifidum, the tansy rosinweed[2] or cutleaf prairie dock, is a species of flowering plant in the family Asteraceae. 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

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

[edit]
  1. ^ a b "Silphium pinnatifidum". NatureServe. Retrieved 2014-05-04.
  2. ^ USDA, NRCS (n.d.). "​Silphium pinnatifidum​". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team. 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. ^ [1] Jessee, L.H. and G. Yatskievych. 2011. A new putative hybrid in Silphium (Asteraceae: Heliantheae). Phytoneuron 2011–62: 1–7.