Photographer: Emmet J. Judziewicz
Iva xanthifolia Nutt.
bur-weed marsh-elder, giant sump-weed
Iva: a Latin derivation from the mint Ajuga iva, which has a similar aroma
xanthifolia: xanthos for "yellow;" folius for "leaves"
|Plant: ||erect, annual, 1 1/2'- 6' tall, unbranched, coarse forb; stems smooth toward the bottom|
|Flower: ||head green to cream, no rays, no bracts; inflorescence with many, mostly stalkless heads in 10" long, large, branched clusters; blooms Aug.-Oct.|
|Leaf:||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|
|Habitat: ||moist; shores, disturbed sites|