Common Cocklebur. Xanthium strumarium, Sunflower or Sunflower Family (Compositae) or (Asteracae), Common Cocklebur. Also called: Clotbur, Rough Cocklebur, Large Cocklebur, Common Cocklebur, Xanthium americanum, Xanthium chinense, Xanthium macrocarpum. We wish to thank Wikipedia, the free encyclopedia for some of the information on this page. We share images and information with Wikipedia. Common cocklebur is a coarse, erect, summer annual that produces a conspicuous prickly "cocklebur" and ranges from about 1/2 to 6 1/2 feet in height. It is considered a weed and it grows just about everywhere in the USA. It now grows just about world wide. Quick Notes: Height: Up To About 1/2 to 6 1/2 Feet Tall. Flowers: Greenish Yellow grapelike clusters of male flowers on a stalk at the leaf axils. Female flowers are smaller at first, just below male, becoming the "bur" fruits. Flowering Time: July to September. Fruit: The fruit is An elliptic shaped two - chambered bur, 1/2 to 1 1/2 inches long and covered with hooked prickles. Each bur contains two seeds, one which grows during the first year and one that grows a year later. Leaves: The first true leaves are opposite, all subsequent leaves are alternate. The alternate triangular to ovate leaves have stiff hairs, and are approximately 2 to 6 inches long. They are irregularly lobed with leaf margins that have relatively inconspicuous teeth. Found: Native to the USA (AL, AR, AZ, CA, CO, CT, DC, DE, FL, GA, HI, IA, ID, IL, IN, KS, KY, LA, MA, MD, ME, MI, MN, MO, MS, MT, NC, ND, NE, NH, NJ, NM, NV, NY, OH, OK, OR, PA, RI, SC, SD, TN, TX, UT, VA, VT, WA, WI, WV, WY), USA+ (PR, VI). Also native to Canada (AB, BC, MB, NB, NS, ON, PE, QC, SK). Also native to northern Mexico in northern Sonora, northern Chihuahua, Baja Norte, Baja California, & Coahuila. Hardiness: USDA Zone 3a: to -39.9 �C (-40 �F) USDA Zone 3b: to -37.2 �C (-35 �F) USDA Zone 4a: to -34.4 �C (-30 �F) USDA Zone 4b: to -31.6 �C (-25 �F) USDA Zone 5a: to -28.8 �C (-20 �F) USDA Zone 5b: to -26.1 �C (-15 �F) USDA Zone 6a: to -23.3 �C (-10 �F) USDA Zone 6b: to -20.5 �C (-5 �F) USDA Zone 7a: to -17.7 �C (0 �F) USDA Zone 7b: to -14.9 �C (5 �F) USDA Zone 8a: to -12.2 �C (10 �F) USDA Zone 8b: to -9.4 �C (15 �F) USDA Zone 9a: to -6.6 �C (20 �F) USDA Zone 9b: to -3.8 �C (25 �F) USDA Zone 10a: to -1.1 �C (30 �F) USDA Zone 10b: to 1.7 �C (35 �F) USDA Zone 11: above 4.5 �C (40 �F) Soil pH requirements: 5.6 to 6.0 (acidic) 6.1 to 6.5 (mildly acidic) 6.6 to 7.5 (neutral) 7.6 to 7.8 (mildly alkaline) 7.9 to 8.5 (alkaline) Sun Exposure: Full Sun Elevation: 0 - 7,000 Feet. Habitat: Commonly found in distrurbed ground, cropland, stream banks, edge of riparian areas. Miscellaneous: Photos Taken September 28, 2008. At Flora Mae Park Riparian Area, Yarnell, Arizona.

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