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Aquatic and Wetland Vascular Plants of the Northern Great Plains

49. Asteraceae, the Aster Family

1. Artemisia L. -- Sage, wormwood

1. Artemisia biennis Willd. -- Biennial wormwood


Erect, taprooted annual or biennial (1)3-12 dm tall, glabrous, weakly aromatic, plants strict to pyramidal in shape. Leaves alternate, pinnately dissected nearly to the middle, 4-12 cm long, 2-5 cm wide, the segments toothed or themselves pinnatisect on lower leaves. Heads discoid, small and numerous, in a dense, spikelike inflorescence or in spikelike branches; involucres campanulate, 2-3 mm high, the bracts imbricate, obovate with broad scarious margins; receptacle naked. Achenes ellipsoid, slightly flattened, 4- to 5-nerved, ca. 0.5 mm long; pappus none. Aug--Sep. A weedy species of shores, stream banks, ditches, mud flats and other places where water stands temporarily; common; (Native to nw U.S., but now widespread in N.Amer. as a weed; Que to B.C., s to NJ, KY, MO, NM and CA).
GIF- Distribution Map

Map key


Return to Family -- Asteraceae - The Aster Family
Next Section -- Aster brachyactis Blake -- Rayless aster

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