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


Artemisia biennis.Glen Mittelhauser.New England Wild Flower 4/2014)

Artemisia biennis. Glen Mittelhauser. New England Wild Flower Society. 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.