Species Factsheets

Pluchea odorata


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State Status: TU
PBS Status: Pennsylvania Endangered (PE)
Federal Status:

Global Rank: G5 rank interpretation
State Rank: S1

Did You Know?

This species is one of only a few plants that exhibits crystallofolia - a unique ribbon-like ice formation appearing during a frost event.

Pluchea odorata


Sweetscent (Pluchea odorata) is an annual herb with a more-or-less hairy stem that may reach 1m in height, but may be much smaller. As the name implies, the entire plant has a camphor-like aroma and is somewhat sticky or greasy to the touch. The leaves are alternately arranged, lance-shaped to eggshaped, from 4-15cm in length and 1-7cm in width, stalkless or short-stalked at the base, pointed at the tip, often somewhat hairy on both surfaces, and usually toothed on the margin. The flowers, appearing from August to October, are pinkish to purple and are grouped in a cluster at the top of the stem.

Rank Justification

Critically imperiled in the nation or state because of extreme rarity (often 5 or fewer occurrences) or because of some factor(s) such as very steep declines making it especially vulnerable to extirpation from the state.


The PA Biological Survey (PABS) has assigned sweetscent a proposed rarity status of Endangered, but has concentrated on identifying locations where the species is occupying relatively natural habitats, and has given a lower conservation priority to populations inhabiting disturbed sites.


Sweetscent grows in natural coastal wetlands, but may also be found in disturbed ground, such as damp clearings, openings, ditches, and along roads.

Survey Dates

Flowers August - October




The more natural habitats have threats from exotic species, dredging and filling, and water pollution.

Conservation Status Map


Map Legend

NatureServe. 2017. NatureServe Explorer: An online encyclopedia of life [web application]. Version 7.1. NatureServe, Arlington, Virginia. Available https://explorer.natureserve.org.


  • NatureServe. 2018. NatureServe Explorer: An online encyclopedia of life [web application]. Version 7.1. NatureServe, Arlington, Virginia. Available at https://www.natureserve.org/explorer
  • Pennsylvania Natural Heritage Program. 2018.
  • Rhoads, A.F. and W.M. Klein, Jr. 1993. The Vascular Flora of Pennsylvania. American Philosophical Society, Philadelphia, Pennsylvania. Rhoads, A.F. and T.A. Block.
  • 2007. The Plants of Pennsylvania: An Illustrated Manual. 2nd edition. University of Pennsylvania Press, Philadelphia, Pennsylvania.
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