horseweed erigeron canadensis flower heads are produced dense inflorescences |
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| navigate by keyword : yellow wind white weed undefined toothed sunflower stem slender seed sand rosette ray purple plant pest pale meadow margin marestail leaves invasive inflorescence horseweed herbaceous head hairy habitat garden fruit flowering flower florets fleabane field family erigeron environment dunes disturbed dispersed disc dense daisy conyza composite compositae coltstail colonizes coarsely centre canadian canadensis butterweed asteraceae aster areas annual agriculture |
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| Horseweed (Erigeron canadensis syn. Conyza canadensis) also known as Canadian horseweed, Canadian fleabane, coltstail, marestail, and butterweed is an annual, herbaceous plant with sparsely hairy stems. Leaves are unstalked, slender, with a coarsely toothed margin. They grow in an alternate spiral up the stem, and the lower ones wither early. The flower heads are small, produced in dense inflorescences. Each flower has a ring of white or pale purple ray florets and a centre of yellow disc florets. The fruit is a cypsela tipped with dirty white down. |
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