BugwoodWiki Article

common ragweed
Ambrosia artemisiifolia L.

Overview

Appearance
Ambrosia artemisiifolia is an annual. It blooms in the late summer and it can grow up to 4 ft. (1.2 m) tall.
Foliage
Stems and leaves are blue-green and covered with fine hairs. Leaves divided and bottom sides covered in fine hairs, giving a gray appearance.
Flowers
Flowers inconspicuous, yellowish-white, and found on terminal branches.
Fruit
Fruits are yellowish to reddish brown, woody, spined, ridged, and crow like in appearance. Seeds are 0.12-0.16 in. (3-4 mm) long.
Ecological Threat
This plant is common throughout the United States and causes hay fever in many people. It is commonly found along ditches and waste areas. It is not highly competitive in crops or rangeland. Native to all U.S. states except Hawaii and Alaska.
Herbicide Resistance
Populations of this plant exist in the United States that are resistant to ALS inhibitors (B/2),Photosystem II inhibitors (C1/5), PPO inhibitors (E/14), Glycines (G/9)

Selected Images


1559044
1559044

common ragweed
Ambrosia artemisiifolia
Plant(s)
Ohio State Weed Lab Archive
1459919
1459919

common ragweed
Ambrosia artemisiifolia
Flower(s)
Steve Dewey
5436890
5436890

common ragweed
Ambrosia artemisiifolia
Foliage
Bruce Ackley
5436879
5436879

common ragweed
Ambrosia artemisiifolia
Foliage
Bruce Ackley
1459512
1459512

common ragweed
Ambrosia artemisiifolia
Flower(s)
Steve Dewey
1120007
1120007

common ragweed
Ambrosia artemisiifolia
Plant(s)
James H. Miller & Ted Bodner
1120008
1120008

common ragweed
Ambrosia artemisiifolia
Plant(s)
James H. Miller & Ted Bodner
1120009
1120009

common ragweed
Ambrosia artemisiifolia
Plant(s)
James H. Miller & Ted Bodner
1391466
1391466

common ragweed
Ambrosia artemisiifolia
Plant(s)
John D. Byrd
1391510
1391510

common ragweed
Ambrosia artemisiifolia
Seedling(s)
John D. Byrd
5436880
5436880

common ragweed
Ambrosia artemisiifolia
Plant(s)
Bruce Ackley

Maps


EDDMapS Distribution - This map is incomplete and is based only on current site and county level reports made by experts, herbaria, and literature. For more information, visit www.eddmaps.org

EDDMapS Distribution

State Regulated List - This map identifies those states that list this species on their regulated list. For more information, visit Invasive.org

State Regulated List

Most Troublesome / Most Common Agricultural Weed List
This map identifies those states that consider this species either most troublesome or most common in at least one commodity. For more information, visit the MTMC project page.

State Regulated List
Legend
   No Data for this state
   Troublesome or Common weed in one or more crops

Taxonomic Rank

Kingdom: Plantae
Phylum: Magnoliophyta
Class: Magnoliopsida
Subclass: Asteridae
Order: Asterales
Family: Asteraceae
Genus: Ambrosia

Other System Links

Plants: AMAR2
Bayer: AMBEL
GRIN: 103817
ITIS: 36496
NPDN Pest: PBFAEBA
NPDN Host: 31728

Synonyms and Other Names

Other Common Names:
annual ragweed, common ragweed, low ragweed, ragweed, Roman wormwood, short ragweed, small ragweed

Categories

Category: Forbs/Herbs