Hemerocallis fulva is a perennial monocotyledon herb, colonial from tubers along dark orange-brown, fleshy roots.
Leaves alternate, basal, strap-like with prominent midrib, margin entire; inflorescence leaves reduced to bracts.
Flowers orange, base yellow, petals 3, sepals 3, very similar, about 12 cm wide across top, , funnel-shaped, showy; inflorescence branched, stem to 1 m; blooms June-July.
Fruit becoming dry, a 3-lobed capsule.
Wetland status: UPL.
Frequency in NYC: Occasional.
Habitat: Along roadsides, and second growth from garden waste; old estate and home garden sites, and disturbed forest understories. Sometimes planted in natural areas.
Notes: Day lily is aggressive and shade tolerant, displacing native herbs; roots and tubers form a dense layer that largely excludes other plants (Douce et al. 2007). Flowers, young leaves and roots apparently edible; plant may also have medicinal uses (Fern 2004; Yatskievych 2006).