Nabalus albus, the white rattlesnake-root or white lettuce, is a plant in the family Asteraceae, native to Canada and the Eastern United States.Plants for a FutureUS Department of Agriculture plants profile Details of the flower heads are needed to separate this species from others in the rattlesnake-root genus (Nabalus). The Iroquois applied a poultice of the roots of white rattlesnake root to rattlesnake bites. It can be found growing in forests, woodlands, and anthropogenic habitats. The flower head has ray flowers only, meaning all of the individual flowers of the flower head have a strap-shaped ray, which may or may not have teeth at the very tip of the ray. The colors vary from blue to purple, pink to red, or white. The leaf blade length can be between 40 and 300 mm. while the flower head width can be 3 to 5 mm. It blooms from July to September in Missouri.Yatskievych, G. 2006. Steyermark's Flora of Missouri. 3 Vols. The Missouri Botanical Garden Press, St. Louis, MO, USA. Vol. 2: 377-382 In 2010 it was reclassified from the genus Prenanthes to Nabalus.
Range White rattlesnake-root is native to Canada and the Eastern United States west into North Dakota, northeast Missouri, and four counties in northwest Arkansas.Gentry, J.L.; Johnson, J.P.; Baker, B. T.; Witsell, C. T.; Ogle, J. D., eds. 2013. Atlas of the Vascular Plants of Arkansas. University of Arkansas Herbarium, Fayetteville, AR, USA It is commonly present in Connecticut, Maine, Massachusetts, New Hampshire, and Vermont.
References
External links http://www.ct-botanical-society.org/galleries/prenanthesalba.html http://wisplants.uwsp.edu/scripts/detail.asp?SpCode=PREALB