Eupatorium altissimum tall boneset Asteraceae EUAL(*); R (DeCandido 2001);

   

Eupatorium altissimum.www.ct-botanical-society.org.Janet Novak

Eupatorium altissimum.Janet.Novak. Copyright © 2002 www.ct-botanical-society.org. (Accessed 7/2014).

Eupatorium altissimum is a perennial herb 80 cm to 2 m tall, stems solitary or paired, usually finely whitish hairy above, very leafy.

Leaves opposite, stalkless, or almost so, blade 5-12 cm long, 0.8-3 cm wide, narrowly elliptic, pointed at both ends, strongly 3-veined from base, margin toothed above middle. 

Eupatorium altissimum flowers.wikimedia.commons

Eupatorium altissimum flowers.wikimedia.commons (accessed 11/2018)

Flowers white, 5 per head, no rays, bracteate base 0.5-0.7 cm long, finely hairy, bracts overlapping, blunt-tipped; blooms Aug-Oct. 

 

 

Eupatorium altissimum fruit. By Steve Hurst. Public Domain. USDA-NRCS Plants Database - plants.usda.gov

Eupatorium altissimum fruit. By Steve Hurst. Public Domain. USDA-NRCS Plants Database – plants.usda.gov (Accessed 11/2018)

Fruit a 5-angled plumed seed (achene). 

Wetland status: UPL. 

Frequency in NYC: Very infrequent. 

Origin: Native to N. J., south, and west. 

Habitat: Dry, open woods.