bur-weed marsh-elder, giant sump-weed
[Iva xanthifolia Nutt.]
Etymology: Iva: a Latin derivation from the mint Ajuga iva, which has a similar aroma
Plants: erect, annual, 1 1/2'- 6' tall, unbranched, coarse forb; stems smooth toward the bottom
Leaves: mostly opposite, upper might become alternate; long-stalked, very widely oval, doubly toothed, roughly hairy on the top, softly fuzzy and light green on the bottom
Flowers: head green to cream, no rays, no bracts; inflorescence with many, mostly stalkless heads in 10" long, large, branched clusters; blooms Aug.-Oct.
Habitat: moist; shores, disturbed sites
Hazardous: Careful, this plant is hazardous!
Conservation Status: Native
Flora of North America: Flora of North America Floristic Rating: Coefficient of Conservatism = 0, Wetland Indicator = FAC USDA Plants Database: Federal Distribution and detailed information including photos