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Montana Field Guide

Montana Field Guides

Annual Wormwood - Artemisia annua
Other Names:  Sweet Annie, Sweet Wormwood, Sweet Sagewort, Annual Mugwort

Non-native Species

Global Rank: GNR
State Rank: SNA

Agency Status
MNPS Threat Rank:
C-value: 1

External Links

General Description
Taprooted annual. Stems erect, simple or branched, 30–80 cm. Herbage glabrous. Leaves cauline, subsessile; blades lanceolate to ovate, 5–15 cm long, 1 to 2 times pinnately divided into linear, sometimes lobed segments. Inflorescence paniculate, leafy-bracteate, with nodding tips. Involucre hemispheric, ca. 1 mm high, wider than high; phyllaries green, glabrous; receptacle glabrous. Disk flowers perfect, 5 to 20, glabrous; corolla ca. 1 mm long; yellow. Achenes glabrous, <1 mm long (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Range Comments
Introduced to most of U.S.; native to Eurasia. Collected in Toole and Yellowstone counties more than 70 years ago (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 4

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density



(Observations spanning multiple months or years are excluded from time charts)



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Citation for data on this website:
Annual Wormwood — Artemisia annua.  Montana Field Guide.  .  Retrieved on , from