horseweed

COMMON NAME: Horseweed
SCIENTIFIC NAME: Conyza canadensis
FAMILY: Asteraceae
LIFECYCLE: Annual
FEATURES: In the vegetative phase- dense lanceolate leaves pubescent at base, leaves alternate, plant rosette-
like. Reproductive phase- plant bolts rapidly producing a large panicle with numerous small heads,
seed contain a pappus facilitating wind dispersion, plant 4 to 6 feet tall.
DESCRIPTION: Tall growing annual plant common along roadsides and prior to planting crops. One of the first
weeds to develop broad-scale resistance to glyphosate (Roundup). (Photos courtesy of Dr. Chris Main).

Broad View Vegetative phase

Broad View
Vegetative phase

Broad View Mature plants

Broad View
Mature plants