Scientific NameAgeratina altissima
Other Common Names:
Synonyms (former Scientific Names):
A perennial plant with erect stems that can grow up to 5ft tall in a season. Flowers typically bloom in the fall.
Leaves are opposite; ovate and serrated along the margins. The base of the leaf is rounded. Leaves may have hairs on the underside.
An erect perennial herb with clusters of small, white flowers. Leaves have a wide, rounded base and have serrated margins. The underside of leaves are often hairy, especially along the central vein. This species is toxic to humans and other mammals.
Flower Seed Head
The small white flowers (3-6mm) are not showy and occur in clusters on the terminals of erect branches.
Fruit is an oblong achene that has a little tuft of hair (papus) on one end.
Typically found in woods, meadows, and along roadsides.
upright and nonwoody
Thorns or Spines
Approximate Flower Diameter
Dominant Flower Color
shorter than leaf,
longer than leaf
Stem Cross Section
round or oval