California Coastal Commission, Public Education Program, Upper Newport Bay Plants

Horseweed (Conyza canadensis)

Plant: Annual, erect, from taproots, to seven feet tall with many branches on the upper part of the plant
Flowers: Numerous white flower heads at ends of branches
Leaf: Alternate on stems, linear leaves that taper at both ends, with toothed edges. Lower leaves wither before flowering. Seedlings develop a basal rosette of egg shaped leaves with toothed edges.