Ambrosia grayi (woollyleaf bur ragweed) is a North American species of plants in the sunflower family. It is native to the west-central part of the Great Plains of the United States, in the states of Nebraska, Kansas, Colorado, New Mexico, Oklahoma, and Texas.
Ambrosia grayi is a perennial herb up to 30 cm (12 inches) tall. Leaves are elliptical or egg-shaped. Flower heads are small and inconspicuous, as the plant is wind-pollinated. The heads develop into spiny burs as the seeds ripen.
- The Plant List Ambrosia grayi (A.Nelson) Shinners
- Flora of North America Vol. 21 Page 17 Ambrosia grayi (A. Nelson) Shinners, Field & Lab. 17: 174. 1949
- "Ambrosia grayi". Natural Resources Conservation Service PLANTS Database. USDA. Retrieved 18 May 2015.
- Biota of North America Program 2014 county distribution map
- Goodwell and Texhoma, Oklahoma Pasture and Roadside Plants; Ambrosia grayi Bur ragweed
- Pollen Library
- Department of Horticulture and Crop Science The Ohio State University, Seed Identification Workshop
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