Flower ID: IMG_2733.JPG-08-16-2019 Flower name (scientific): Ambrosia trifida var. trifida Linnaeus PY: 1753 Flower name (common): Giant Ragweed Family name (common): Aster Family name (scientific): Asteraceae Scientific name origin: Genus: Specific epithet: Common name origin: Flower description: Size: 0.1 to 0.2 inches ( 0.3 to 0.5 cm) Petal count: 0 Color: green or yellow Other: flower arrangement, Raceme Plant description: Size: 24 to 144 inches ( 61. to 366. cm) Stem hairy: Other: Leaf description: attachment is opposite, type is simple and lobed Size: Color: Hairy: Other: Shape: leaf, rounded-deltate to ovate or elliptic (FNA) Origin (native, introduced, invasive): Native Status (common, uncommon, threatened, rare): Common Bloom time (typical): August to September Cycle (annual, biennial, perennial): Annual Habitat: Fruit: Seed: Importance to wildlife: How to differentiate related varieties: Ambrosia trifida var. texana is treated as a syn. of Ambrosia trifida by WFO, WCVP, and POWO. The GCD lists it as uncertain (unassessed). The SERNEC lists it and gives its range as the southern states AZ, NM, TX, and MS. If Ambrosia trifida var. texana is accepted, then the variety present in WI is the autonym Ambrosia trifida var. trifida. Ethnobotany: Latitude: 44.796955 Longitude: -91.502895 Altitude: 241.60 Distribution: In Wisconsin: (Ashland, Barron, Bayfield, Brown, Buffalo, Calumet, Clark, Columbia, Crawford, Dane, Dodge, Douglas, Eau Claire, Fond du Lac, Forest, Grant, Green, Iowa, Iron, Jackson, Jefferson, Kenosha, La Crosse, Lafayette, Lincoln, Marinette, Marquette, Milwaukee, Monroe, Oconto, Outagamie, Ozaukee, Pepin, Pierce, Polk, Racine, Richland, Rock, Rusk, Sauk, Sawyer, Shawano, Sheboygan, St. Croix, Taylor, Trempealeau, Vernon, Walworth, Washington, Waukesha, Waushara, Winnebago) Click here for distribution map In US: (AL, AR, AZ, CA, CO, CT, DC, DE, FL, GA, IA, ID, IL, IN, KS, KY, LA, MA, MD, ME, MI, MN, MO, MS, MT, NC, ND, NE, NH, NJ, NM, NY, OH, OK, OR, PA, RI, SC, SD, TN, TX, UT, VA, VT, WA, WI, WV, WY) In Canada: (AB, MB, NB, NS, ON, PE, QC, SK) References: