Silphium trifoliatum

Silphium trifoliatum
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Asterales
Family: Asteraceae
Genus: Silphium
Species:
S. trifoliatum
Binomial name
Silphium trifoliatum

Silphium trifoliatum, commonly known as whorled rosinweed,[1] is a species of flowering plant in the family Asteraceae. It is native to the eastern United States, where it is found east of the Mississippi River.[1] Its natural habitat is open, grassy areas such as prairies, river cobble bars, and roadsides.[2] It is a tall perennial that produces heads of yellow flowers in mid-summer through fall.[3]

This species is considered to be a variety of Silphium asteriscus by some authors. It can be distinguished by its smooth stems and leaves that are often in whorls of three. In contrast, S. asteriscus has scabrous to hispid stems and leaves, which are opposite or alternate. In addition, S. trifoliatum has eglandular pales (the bracts in the flower heads), while the pales of S. asteriscus are often glandular.[4] There remains much disagreement about the best taxonomic treatment of the S. asteriscus complex.[2]

References

  1. ^ a b NRCS. "Silphium trifoliatum". PLANTS Database. United States Department of Agriculture (USDA). Retrieved 28 January 2018.
  2. ^ a b Chester, Edward (2015). Guide to the Vascular Plants of Tennessee.
  3. ^ Silphium asteriscus var. trifoliatum Flora of North America
  4. ^ Alan Weakley (2015). "Flora of the Southern and Mid-Atlantic States".

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