Ageratina aromatica
Ageratina aromatica was first described as Eupatorium aromaticum by Linnaeus in 1753. It was renamed to its current epithet by Edouard Spach in Histoire Naturelle des vegetaux in 1841.
Ageratina aromatica is a perennial herb with highly clustered heads of small white flowers found mostly in the eastern United States.
Ageratina aromatica is considered endangered by the states of Connecticut, Massachusetts and New York. It is listed as threatened in Ohio and historical in Rhode Island. (USDA Plants, 2010.)
The primary threat to Ageratina aromatica is habitat loss due to development and forest succession. (Craine, 2003.)
Ageratina aromatica has a diploid number of 2n = 34. (Nesom, 2006.)
Intergrades have been found between A. aromatica and A. altissima, and also between A. aromatica and A. jucunda in their respective sympatric regions. (Nesom, 2006.)
A. aromatica is spread out over the eastern United States. It stretches from its northern border of Connecticut west over to Ohio, south to Florida and over to the Atlantic Coast, excluding Georgia. (Nesom, 2006.)
For more information, see the map above provided by Flora of North America.
Ageratina aromatica grows in sandy soils and dry forests, but also in most settings from 100 to 900 m in altitude. (Nesom, 2006.)
Perennial
Ageratina aromatica usually flowers from August to October, sometimes as late as November. (Nesom, 2006.)