Botanical name: Erigeron canadensis    Family: Asteraceae (Sunflower family)
Synonyms: Conyza canadensis, Aster canadensis, Conyza parva

Canadian Horseweed is an annual herb growing up to 1.5 m tall, with sparsely hairy stems. The leaves are slender, 2-10 cm long and up to 1 cm broad, with a coarsely toothed margin. The flowers are produced in dense inflorescences 1 cm in diameter, with a ring of white or pale purple ray florets and a center of yellow disc florets. Horseweed is commonly considered a weed, and is native to the American continents. It is widely naturalized in other parts of the world. It can be found in the Himalayas upto an altitudes of 3000 m.

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The flower labeled Canadian Horseweed is ...