Euthamia graminifolia is a perennial herb, 30-150 cm tall, extensively clonal from rhizomes; few or no axillary branches; winter stem brown, flower bases (receptacles) star-shaped, bracts hairy, overlapping (Levine 1995).
Leaves alternate, stalkless, blade 4-13 cm long, 0.3-1.2 cm wide, linear to lance-shaped, 3-veined, sprinkled with minute translucent dots (use lens).
Flowers yellow, rays 15-25, per head, about 0.1 cm long, disk flowers 5-10 per head; bracteate base 0.3-0.5 cm long; heads in dense, rounded clusters; inflorescence branched, flat-topped. Self- incompatible, pollinated by bees feeding on nectar and pollen, also visited by wasps, flies and soldier beetles; flowers eaten by Blister beetles, Epicauta pennsylvanica. (Gross and Werner 1983); blooms Aug.-Sept.
Fruit dry, 1-seeded achene with plume of tan bristles; wind dispersed. Seeds eaten by some birds and small mammals, foliage eaten by rabbits (Martin et al. 1951).
Wetland status: FAC.
Frequency in NYC: Frequent.
Habitat: Open areas, dry to moist soil of meadows, roadsides and path edges.
Notes: Leaf extracts shown to inhibit seed germination of some other plants (Butcko and Jensen 2002).