Conyza canadensis

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Taxonomy
Kingdom: Plantae
Phylum: Magnoliophyta
Class: Magnoliopsida
Order: Asterales
Family: Asteraceae
Genus: Conyza
Species: C. canadensis
Scientific Name
Conyza canadensis
(L.) Cronq.
Common Names

horseweed, Canadian horseweed, Canada horseweed, horseweed, horseweed fleabane, mare's tail, marestail

Overview

Appearance
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.
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.

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