Eupatorium album

Eupatorium album
Eupatorium album var. album, 1913 botanical illustration
Conservation status
Secure  (NatureServe)[1]
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Asterids
Order:	Asterales
Family:	Asteraceae
Genus:	Eupatorium
Species:	E. album
Binomial name
Eupatorium album L.
Synonyms[2]
Synonymy Uncasia alba (L.) Greene Eupatorium fernaldii R.K.Godfrey Eupatorium glandulosum Michaux Eupatorium petalodium Britton ex Small Eupatorium petaloideum Britton ex Britton Eupatorium stigmatosum Bertol. 1846 not Meyen & Walp. 1843 nor Chodat 1843 Uncasia petaloidea (Britton ex Small) Greene

Eupatorium album, the white thoroughwort, is a herbaceous perennial plant in the family Asteraceae native from the eastern and southern United States, from eastern Texas to Connecticut, inland as far as Indiana.^[3][4]

As with other members of the genus Eupatorium, Eupatorium album flowers with large numbers of small white heads. The flower heads have 4-5 disc florets each, but no ray florets.^[5] The plant grows 50–100 cm (20–39 in) tall,^[3] making it one of the shorter Eupatorium species.^[5]

Eupatorium album is capable of hybridizing with other Eupatorium species including Eupatorium sessilifolium and Eupatorium serotinum.^[3] Its appearance is similar to Eupatorium altissimum, but differs in that the bracts (located at the base of the flower head) taper to a long point.^[6]

Eupatorium album grows in dry, open areas such as power lines, old fields, and eroded slopes. It will not grow under a shady canopy, but can be found in some open woods such as pine barrens.^[6]

Varieties^[3]

• Eupatorium album var. album - most of species range
• Eupatorium album var. subvenosum A. Gray - Delaware, District of Columbia, New Jersey, New York
• Eupatorium album var. vaseyi (Porter) Cronquist - from Alabama to Pennsylvania

References

1. "Eupatorium album". NatureServe Explorer. NatureServe. Retrieved 2010-09-12.^{[permanent dead link‍]}
2. The Plant List, Eupatorium album L.
3. "Eupatorium album". Flora of North America.
4. Biota of North America Program 2014 county distribution map
5. "Eupatorium". Flora of North America.
6. Rebecca W. Dolan (September 2004). "Conservation Assessment for White thoroughwort (Eupatorium album L.)" (PDF). United States Forest Service, Eastern Region of the Forest Service - Threatened and Endangered Species Program.

Further reading

• Herz, W; Sharma, Rp (March 1976). "New hydroxylated ent-kauranoic acids from Eupatorium album". The Journal of Organic Chemistry. 41 (6): 1021–6. doi:10.1021/jo00868a023. ISSN 0022-3263. PMID 1255283.

External links

• Alabama Plants, Photographs and information for the plants of Alabama, USA , including photos.
• photo of herbarium specimen at Missouri Botanical Garden, collected in Missouri in 2012