Conyza canadensis
From Bugwoodwiki
__TOCF__
|
Overview
- Appearance
- An annual with a long taproot and one or more stems arising from a basal rosette, normally about 3.3 ft. (1 m) tall.
- Foliage
- 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.
- Flowers
- 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
- 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.
Resources
University of Massachusetts Amherst Extension [1]
Virginia Tech Weed Identification Guide [2]
CABI Invasive Species Compendium [3]
North Carolina State University [4]
USDA NRCS PLANTS [5]
USDA ARS GRIN [6]
www.eFloras.org [7]
Images from Bugwood.org
