Symphyotrichum urophyllum (Aster sagittifolius) arrow-leaf aster Asteraceae ASSA; Bx, pb (DeCandido 2001);

aster-sagittifolius-uwsp-edu-freckmann-herbarium-university-of-wisconsin-stevens-point

Aster sagittifolius.uwsp.edu.Freckmann.Herbarium.University of Wisconsin Stevens Point

Symphyotrichum urophyllum is a perennial 40-120 cm tall, from a root crown.

Leaves alternate, stalk long, blade 6-15 cm long, 2-6 cm wide, tip pointed, base lobed thick, margin toothed, upper leaves with unlobed base, stalk winged, or stalkless. 

Flowers: ray flowers pale blue, 8-20, 4-8 mm long, bracteate base 4-6 mm long, bracts overlapping, tip and midrib green, heads numerous, crowded, stalks covered with small bracts, blooming Aug.-Oct. 

Fruit dry, 1-seeded, achene, with tuft of hairs (pappus), wind dispersed. 

Wetland status: UPL. 

Frequency in NYC: Very infrequent. 

Origin: Native. 

Habitat: Dry open woods.