Artemisia biennis|biennial wormwood|Asteraceae

Artemisia biennis. Glen Mittelhauser. New England Wild Flower Society. gobotany.newenglandwild.org.(Accessed 4/2014)

Artemisia biennis is an annual to biennial herb, not aromatic, 30 cm to 3 m tall.

Leaves alternate, blade 5-15 cm long, deeply, pinnately divided, lobes toothed to divided.

Flowers greenish yellow, very small, in compact heads that arise from a bract-covered floral base (receptacle), flowers tubular, radially symmetrical (disc flowers) only, heads 0.2-0.3 cm high, basal bracts membranous, rounded, nearly covering flowers; inflorescence of very densely crowded flower heads in spike-like clusters in upper leaf axils; Aug.-Oct.

Fruit dry, 1-seeded (achene).

Wetland status: FACU-.

Frequency in NYC: Very infrequent.

Origin: NW United States.

Habitat: Sandy soil, open areas.

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Artemisia biennis biennial wormwood Asteraceae ARBI*; R (DeCandido 2001);