Erigeron canadensis or Horseweed or Canadian horseweed or Canadian fleabane or Coltstail or Marestail or Conyza canadensis and Butterweed is an annual wild plant in the Asteraceae family that is considered a weed. The stems are sparsely hairy, the leaves are stemless, slender, 2–10 cm long with a rough toothed edge. They grow in an alternate spiral up the trunk and the flowers are white-purple. Some parts of this plant are commonly used as medicine for several diseases.
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Weeds: 1) Field horsetail, (Equisetum arvense), sporangium (a), spur (b+c), stem cross section (d); 2) Red sorre (Rumex acetosella), blossom (a), ovary (b), fruit (c); 3) Canadian horseweed (Erigeron canadensis, or Erigeron canadense), leaves (a+b), fruit wit pappus; 4) Field bindweed (Convolvulus arvensis), blossom intersected (a), fruit (b), seed (c); 5) Knotgrass (Polygonum aviculare), stem with leaf sheath (a), blossom (b), fruit (c); 6) Coltsfoot (Tussilago farfara), edge blossom (a+b), disc flower (c+d), fruit with pappus; 7) Wild radish (Raphanus raphanistrum), petal (a), fruit (b), seed (c); 8) Charlock mustard (Sinapis arvensis), blossom (a), fruit (b), seed (c); 9) Eastern groundsel (Senecio vernalis), edge blossom (a), fruit with pappus (b); 10) Creeping thistle (Cirsium arvense), male (a) and female blossom (b), fruit with pappus (c), papus bristle (d); 11) Annual nettle (Urtica urens), stinging hair (a) blossom (b), fruit (c); 12) Potato weed (Galinsoga parviflora), blossomcrown (a), edge blossom (b), disc flower (c). Wood engravings, published in 1897.
The chicory plant originally came from the Mediterranean and traveled from Europe to spread across North America with the colonists. The color is usually blue or lavender and the flower remains on the plant only one day, with quantities of stiff hairs on the underside of the chicory flower. It stores a white milky sap the oozes out if the stem is broken. The height of the chicory is about five feet tall with a long taproot. Common names include blue sailors, blue dandelion, coffeeweed, radicchio and succory.
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