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Silphium asteriscus

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

Silphium asteriscus, commonly called starry rosinweed,[2] is an herbaceous plant in the family Asteraceae. It is native to the eastern United States, from Oklahoma and Texas east to Florida and Pennsylvania.[3] It is a widespread species found in a variety of open habitats, such as prairies and woodlands.[4]

Taxonomy

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Additional research is needed to better understand the taxonomy of this species. It remains perhaps the most poorly-understood Silphium in eastern North America.[5] It appears to show a high level of local variability throughout its range, which has been interpreted as either a species complex, a single highly variable species, or some combination of both. Due to conflicting information about the best circumscription of the varieties, the taxonomy of this species remains unsettled.[6][7]

The most recent treatment from 2020 ranked Silphium asperrimum, Silphium dentatum and Silphium simpsonii at species status.[7] If adopted, this leaves S. asteriscus with three remaining varieties. They are:

  • Silphium asteriscus var. asteriscus - Appalachian and eastward; with a congested, hispid inflorescence
  • Silphium asteriscus var. laitoflium - south and west of the Appalachians; with broad, opposite leaves and a spreading glabrous inflorescence
  • Silphium asteriscus var. trifoliatum - widespread; similar to the above but with narrow whorled leaves[7]

References

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  1. ^ "Silphium". Index Nominum Genericorum. International Association for Plant Taxonomy. 9 February 1996. Retrieved 24 June 2008.
  2. ^ USDA, NRCS (n.d.). "​Silphium asteriscus​". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team. Retrieved 18 January 2017.
  3. ^ "Silphium asteriscus". County-level distribution map from the North American Plant Atlas (NAPA). Biota of North America Program (BONAP). 2014. Retrieved 18 January 2017.
  4. ^ Flora of North America
  5. ^ Chester, Edward (2015). Guide to the Vascular Plants of Tennessee.
  6. ^ Flora of Missouri
  7. ^ a b c "Flora of the Southern and Mid-Atlantic States".
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