Ambrosia artemisiifolia
(Common Ragweed)

Other pictures of this plant:

               Seedpod                                           Leaf                                            Stem                                        Seed                                          Habit

Facts About this Plant:

    Common Names: Common Ragweed, Annual Ragweed
    Lifespan: Annual
    Zones: N/A
    Type: Forb
    Bloom Time: August - October
    Status: Native

Ambrosia artemisiifolia, or Common Ragweed, is native and reported in the entire United States, but is considered adventive in the western third of the US. It is an annual that grows in dry fields, in prairies and meadows, along roads, trails and roadsides and woodland edges, as well as in waste places and yards. It blooms late in the season, usually in late summer and early fall, with very small green-yellow flowers. This plant, though native, is what is responsible for fall seasonal allergies, as it releases large amounts of pollen. However, the plant is very important for birds and other animals as a food source.

There are several plants in this genus, but only three are very widely distributed: Ambrosia artemisiifolia, Ambrosia psilostachya, and Ambrosia trifida. The former two can be easily distinguished by their leaves - Ambrosia artemisiifolia has deeply divided leaves with many divisions, but Ambrosia trifida typically has large leaves that are split into one, three or five lobes. See comparison photo. More information on other species will be posted later.

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