Eupatorium resinosum

Eupatorium resinosum, or pine barren thoroughwort, is a rare North American plant species in the sunflower family.

Pine barren thoroughwort
E. resinosum in bloom.

Vulnerable  (NatureServe)[1]
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Asterales
Family: Asteraceae
Genus: Eupatorium
Species:
E. resinosum
Binomial name
Eupatorium resinosum
Torr. ex DC. 1836 not Poepp. & Endl. 1845
Synonyms[2]
  • Uncasia resinosa (Torr.) Greene

Eupatorium resinosum is native to the eastern coastal states of the United States, though with a discontinuous distribution. Some populations grow in the Carolinas, others in New Jersey. It formerly grew in New York and Delaware, but is now apparently extirpated there. There are no reports of the species in Maryland or Virginia in between.[3][4]

Eupatorium resinosum has stems up to 100 cm (40 inches) tall and produce short rhizomes. The inflorescences are composed of a large number of tiny white flower heads with 7-11 disc florets but no ray florets.[3] This species typically grows in moist areas, areas with acidic soils, and pine barrens.[5] It is pollinated by insects and is self-incompatible.[6] It is rare, with only dozens of populations known, and has been extirpated from several states due to habitat destruction.[6]

References
  1. "Eupatorium resinosum". NatureServe Explorer. NatureServe. Retrieved 2010-09-12.
  2. The Plant List, Eupatorium resinosum Torr. ex DC.
  3. "Eupatorium". Flora of North America.
  4. Biota of North America Program 2014 county distribution map
  5. "Eupatorium resinosum". Flora of North America.
  6. Diane L. Byers (1998). "Effect of cross proximity on progeny fitness in rare and a common species of Eupatorium (Asteraceae)". American Journal of Botany. Botanical Society of America. 85 (5): 644–653. doi:10.2307/2446533. JSTOR 2446533. PMID 21684945.
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