giant ragweed, great ragweed, horse-cane
[Ambrosia integrifolia Muhl. ex Willd., more...]
Etymology: Ambrosia: Greek for "food of the gods"
Plants: erect, annual, 2'-9' tall forb
Leaves: opposite, stalked, 3-5 palmately-divided lobes, upper leaves slightly winged
Flowers: inflorescence of many, small, green, bead-like heads on 10" spikes; blooms Aug.-Sept.
Fruits: seeds not on fluffy pappus
Habitat: moist; disturbed sites
Conservation Status: Native - potentially invasive
Flora of North America: Flora of North America Floristic Rating: Coefficient of Conservatism = 0, Wetland Indicator = FAC+ WIS DNR-Bureau of Endangered Resources: Detailed information on Wisconsin invasive species including decription, habitats, control methods USDA Plants Database: Federal Distribution and detailed information including photos Dan Tenaglia's The Missouri Flora: Fabulous photographs; detailed descriptions; color and leave arrangement key. David G. Smith's "Delaware Wilflowers": Beautiful photographs; descriptions Illinois Wildflowers: Wonderful photographs; detailed descriptions; color and leaf arrangement key Southwest School of Botanical Medicine: Britton & Brown Illustrated Flora - 2nd Edition (1913) "An Illustrated Flora of the Northern United States and Canada"