Ageratina herbacea

Used to be in the genus Eupatorium. Found in moist, rocky areas, for instance the upper part of the Aguirre Spring trail in the Organs, and Monticello Box in the southern San Mateo Mts.

Pseudanthia along the Pine Tree Trail at Aguirre Spring, 9/17/05.

Upper cauline leaf at Aguirre Spring, 9/17/05.