Eupatorium hyssopifolium

Eupatorium hyssopifolium, also known as hyssopleaf thoroughwort, is a fall-blooming herbaceous plant native to North America.[3] Like other members of the genus Eupatorium it has inflorescences containing a large number of very small flower heads, each with 5 white disc florets but no ray florets.[4] At 0.5 to one meter (20-40 inches) tall,[3] it is towards the shorter end of the range of heights found in Eupatorium species.[4]

Eupatorium hyssopifolium
E. hyssopifolium in bloom.

Secure  (NatureServe)[1]
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Asterales
Family: Asteraceae
Genus: Eupatorium
Species:
E. hyssopifolium
Binomial name
Eupatorium hyssopifolium
Synonyms[2]

Plants which are classified as E. hyssopifolium can be either diploid or polyploid, and some of them seem to have been the result of past hybridizations with Eupatorium serotinum. Hybrids with E. album and E. linearifolium also seem to exist. The hybrid E. torreyanum is similar to E. hyssopifolium but is a hybrid of E. serotinum and Eupatorium mohrii.[3]

Eupatorium hyssopifolium is found in much of the eastern and south-central United States, from Massachusetts west to Wisconsin, and as far south as Texas and Florida.[3][5] It grows in moist soils.[6]

Varieties[3]
  • Eupatorium hyssopifolium var. hyssopifolium - leaves 2–5 mm wide
  • Eupatorium hyssopifolium var. laciniatum A.Gray - leaves 5–15 mm wide

Uses

Eupatorium hyssopifolium can be used medicinally (applied externally for insect and reptile bites).[6] It can also be planted near crops to attract beneficial insects.[7]

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References
  1. "Eupatorium hyssopifolium". NatureServe Explorer. NatureServe. Retrieved 2010-09-12.
  2. "Eupatorium hyssopifolium L.". The Global Compositae Checklist (GCC) – via The Plant List.
  3. Siripun, Kunsiri Chaw; Schilling, Edward E. (2006). "Eupatorium hyssopifolium". In Flora of North America Editorial Committee (ed.). Flora of North America North of Mexico (FNA). 21. New York and Oxford – via eFloras.org, Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
  4. Siripun, Kunsiri Chaw; Schilling, Edward E. (2006). "Eupatorium". In Flora of North America Editorial Committee (ed.). Flora of North America North of Mexico (FNA). 21. New York and Oxford – via eFloras.org, Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
  5. "Eupatorium hyssopifolium". Natural Resources Conservation Service PLANTS Database. USDA.
  6. "Eupatorium hyssopifolium". Plants for a Future.
  7. Frank, SD; Shrewsbury, PM; Esiekpe, O (April 2008). "Spatial and temporal variation in natural enemy assemblages on Maryland native plant species". Environmental Entomology. 37 (2): 478–86. doi:10.1603/0046-225X(2008)37[478:SATVIN]2.0.CO;2. ISSN 0046-225X. PMID 18419920.
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