Summer Wildflowers of Mount Holyokeby Karen Searcy
Ageratina altissima (White Snakeroot)
Flower colorwhite
Number of petals5
Petal fusionfree
Lea arrangementopposite
Leaf groupingsimple
Leaf marginstoothed
Leaf/leaflet shapeegg-shaped to heart-shaped
Fruit typedry
Flowering datesAug - Sept
HabitatMoist woods
DescriptionThis species is from 1 - 4 feet tall, branched and leafy. The coarsely serrate, opposite leaves have long petioles and a tip that tapers to a point. The white flowers are all tubular and have a long branched style that projects beyond the mouth of the tube. The inflorescence is flat topped. It is poisonous.
CommentPrevious name = Eupatorium rugosum.
Habit photoKBS
Flower photoPW
Leaf photoAT