- Conyza canadensis is an annual with a long taproot and one or more stems arising from a basal rosette, normally about 3.3 ft. (1 m) tall.
- Leaves are up to 4 in. (10 cm) long and about 0.4 in. (1 cm) wide with some shallow teeth, green with some scattered hairs. Leaf margins ciliate and with longer hairs towards the base of the leaf.
- Flower heads are very numerous on short pedicels, only 0.08-0.12 in. (2-3 mm) in diameter. Disc florets are yellow, contrasting with distinct white ray florets which are 0.02-0.04 in. (0.5-1 mm) long.
- Fruit is light brown and has tufts of white or light brown hair. Seeds 0.04-0.05 in (1-1.3 mm) long with 10-25 off-white pappus hairs, 0.08-0.16 in. (2-4 mm) long.
- Ecological Threat
- Conyza canadensis is a common weed in temperate to tropical regions, preferring disturbed sites such as vacant lots, pastures, and on roadsides. This plant is native to North America.
University of Massachusetts Amherst Extension 
Flora of North America, www.eFloras.org 
Virginia Tech Weed Identification Guide 
North Carolina State University 
USDA NRCS PLANTS 
USDA ARS GRIN 
Images from Bugwood.org