Orange Day Lily,  Hemerocallis fulva
Liliaceae or Lily Family

Erect plant with long narrow leaves and large, showy, orange, lily-like flowers.  Blooms mid to late summer.  Fails to produce seed or fruit, but spreads readily by underground runners

A common introduced weed, originally a garden ornamental.  It is common in Wildwood in open disturbed places, especially near the Outdoor Classroom.

Yellow day lily (Hemerocallis lilioasphodelus) is very similar, but has yellow flowers, blooms a little earlier, and has not lost the ability to produce seeds.