Eupatorium rotundifolium
| Roundleaf thoroughwort | |
|---|---|
 | |
| photo by Robert H. Mohlenbrock [1] | |
| Scientific classification | |
| Kingdom: | Plantae |
| (unranked): | Angiosperms |
| (unranked): | Eudicots |
| (unranked): | Asterids |
| Order: | Asterales |
| Family: | Asteraceae |
| Tribe: | Eupatorieae |
| Genus: | Eupatorium |
| Species: | E. rotundifolium |
| Binomial name | |
| Eupatorium rotundifolium L. | |
| Synonyms[3] | |
|
Synonymy
| |
Eupatorium rotundifolium, commonly called Roundleaf thoroughwort, is a North American species of plant in sunflower family. It native to the eastern and central United States, in all the coastal states from Maine to Texas, and inland as far as Missouri and the Ohio Valley.[4]
The stems up to 100 cm (40 inches) tall and are produced from short rhizomes. The inflorescences are composed of a large number of small white flower heads, each with 5 disc florets but no ray florets. Plants can be highly variable due to hybridization, three varieties have been named.[5]
- Varieties[3]
- Eupatorium rotundifolium var. ovatum (Bigelow) Torr.
- Eupatorium rotundifolium var. rotundifolium
- Eupatorium rotundifolium var. scabridum (Elliott) A.Gray
Hybrids and related species
As is common in Eupatorium, E. rotundifolium can form hybrids with other species in the genus. In particular, Eupatorium godfreyanum is a hybrid of E. rotundifolium and Eupatorium sessilifolium.[6]
The plants known as Eupatorium rotundifolium var. saundersii have often been treated as a variety of E. rotundifolium. They can be distinguished based on morphology,[7] and molecular evidence also suggests that these plants may be different enough from E. rotundifolium to recognize them as a species, Eupatorium pilosum.[6]
Chemical constituents
Eupatorium rotundifolium contains sesquiterpene lactones of the guaianolide type including euparotin acetate and eupachlorin acetate, both of which inhibit tumor growth in vitro when isolated from the plant.[8][9]
References
- ↑ Robert H. Mohlenbrock @ USDA-NRCS PLANTS Database / USDA NRCS. 1995. Northeast wetland flora: Field office guide to plant species. Northeast National Technical Center, Chester.
- ↑ "Eupatorium rotundifolium". NatureServe Explorer. NatureServe. Retrieved 2010-09-12.
- 1 2 The Plant List, Eupatorium rotundifolium L.
- ↑ Biota of North America Program 2014 county distribution map
- ↑ Flora of North America, Eupatorium rotundifolium Linnaeus, 1753. Roundleaf thoroughwort
- 1 2 Kunsiri Chaw Siripun and Edward E. Schilling (2006). "Molecular confirmation of the hybrid origin of Eupatorium godfreyanum (Asteraceae)". American Journal of Botany 93 (2): 319–325. doi:10.3732/ajb.93.2.319. PMID 21646192.
- ↑ "18. Eupatorium pilosum Walter".
- ↑ Kupchan SM, Kelsey JE, Maruyama M, Cassady JM. (June 1968). "Eupachlorin acetate, a novel chloro-sesquiterpenoid lactone tumor inhibitor from Eupatorium rotundifolium". Tetrahedron Lett. 31 (31): 3517–3520. doi:10.1016/S0040-4039(01)99098-7. PMID 5649802.
- ↑ Kupchan SM, Hemingway JC, Cassady JM, Knox JR, McPhail AT, Sim GA. (18 January 1967). "The isolation and structural elucidation of euparotin acetate, a novel guaianolide tumor inhibitor from Eupatorium rotundifolium". J Am Chem Soc. 89 (2): 465–466. doi:10.1021/ja00978a061. PMID 6031638.
