Laennecia coulteri, commonly known as Coulter's horseweed, is a plant in the family Asteraceae. It is native to western North America, including California, Nevada, Arizona, New Mexico, Utah, Colorado, Texas, and Northern Mexico. Laennecia coulteri is a herbaceous annual with glandular stems and leaves, generally growing to 3-5 feet tall. It blooms from April - November, depending on location. Often found in disturbed habitats, stream banks, washes, fields, and roadsides in sandy, clayey, or alkaline soils.
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