Eutrochium

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Joe-Pye weeds
Joe-Pye weed in flower
Scientific classification
Kingdom: Plantae Division: Magnoliophyta Class: Magnoliopsida Subclass: Asteridae (unranked) Euasterids II Order: Asterales Family: Asteraceae Subfamily: Asteroideae Tribe: Eupatorieae Subtribe: Eupatoriinae Genus: Eutrochium Rafinesque
Species
E. dubium E. fistulosum E. maculatum E. purpureum E. steelei
Synonyms
Eupatoriadelphus

Eutrochium is a genus of herbaceous flowering plants in Asteraceae. This plant is commonly referred to as Joe-Pye Weed. They are native from Eastern North America and have non-dissected foliage and pigmented flowers. It includes all the purple flowering North American species of the genus Eupatorium as traditionally defined.^[1] Eupatorium has recently undergone some revision and has been broken up into smaller genera.^[2] Eutrochium is the senior synonym of Eupatoriadelphus.^[3] Eupatorium in the revised sense (about 42 species of white-flowered plants from the temperate Northern hemisphere) is apparently a close relative of Eutrochium. Eupatorium and Eutrochium are both placed in the subtribe Eupatoriinae, but South American plants which have sometimes been placed in that subtribe, such as Stomatanthes, seem to belong elsewhere in the tribe Eupatorieae.^[4]

The taxa that belong to Eutrochium are:^[5]

• Eutrochium dubium (Willdenow ex Poiret) E. E. Lamont – Coastal Plain Joe-Pye Weed
• Eutrochium fistulosum (Barratt) E. E. Lamont – Hollow Joe-Pye Weed
• Eutrochium maculatum (Linnaeus) E. E. Lamont – Spotted Joe-Pye Weed[1]
  • Eutrochium maculatum var. bruneri (A. Gray) E. E. Lamont
  • Eutrochium maculatum var. foliosum (Fernald) E. E. Lamont
  • Eutrochium maculatum var. maculatum
• Eutrochium purpureum (Linnaeus) E. E. Lamont – Sweet Joe-Pye Weed, Green-stemmed Joe-Pye Weed, Queen of the Meadow, Gravel Root, Kidney Root, Purple Boneset
  • Eutrochium purpureum var. holzingeri (Rydberg) E. E. Lamont
  • Eutrochium purpureum var. purpureum
• Eutrochium steelei (E. E. Lamont) E. E. Lamont

[edit] Footnotes

[edit] References

• Ito, Motomi; Watanabe, Kuniaki; Kita, Yoko; Kawahara, Takayuki; Crawford, D.J. & Yahara, Tetsukazu (2000): Phylogeny and Phytogeography of Eupatorium (Eupatorieae, Asteraceae): Insights from Sequence Data of the nrDNA ITS Regions and cpDNA RFLP. Journal of Plant Research 113(1): 79-89. doi:10.1007/PL00013913 (HTML abstract)
• Lamont, Eric E. (2004): New combinations in Eutrochium, an earlier name for Eupatoriadelphus. Sida 21: 901-902.
• Lamont, Eric E. (2006): 393. Eutrochium Rafinesque. In: Flora of North America North of Mexico, Vol. 21 (Magnoliophyta: Asteridae, part 8: Asteraceae, part 3): 461-462, 474-475. ISBN 0195305654
• Schmidt, Gregory J. & Schilling, Edward E. (2000): Phylogeny and biogeography of Eupatorium (Asteraceae: Eupatorieae) based on nuclear ITS sequence data. Am. J. Bot. 87(5): 716-726. PMID 10811796 PDF fulltext
• Siripun, Kunsiri Chaw & Schilling, Edward E. (2006): Molecular confirmation of the hybrid origin of Eupatorium godfreyanum (Asteraceae). Am. J. Bot. 93(2): 319-325. PDf fulltext