Lactuca biennis tall blue lettuce Asteraceae LABI; Bx pb, wv (Yost et al. 1991); R, gb;

   

Lactuca biennis.Marilee Lovit.New England Wild Flower Society.gobotany.newenglandwild.org

Lactuca biennis.Marilee Lovit.New England Wild Flower Society.gobotany.newenglandwild.org. (Accessed 4/2014).

Lactuca biennis is an annual or biennial herb, (NYS S1, E) large, 60 cm to 3 m tall, sap milky. 

Leaves alternate, 10-40 cm long, 4-20 cm wide, irregularly pinnately divided, base lobed, margin toothed, upper leaves stalkless. 

Flowers blue-white, all rays, heads with 15-34 flowers, bracteate base about 1 cm tall in fruit; heads crowded in a narrow, branched inflorescence; blooms and fruits July-Sept. 

Fruit dry 1-seeded achene, seed 0.5 cm with pale brown plume; seeds eaten by birds, plants eaten by deer (Martin et al. 1951). 

Wetland status: FACU. 

Frequency in NYC: Very infrequent. 

Origin: Native 

Habitat: Moist open areas, gaps in open woods.