Taken from the Missouri Weed ID Guide: http://weedid.missouri.edu//weedinfo.cfm?weed_id=210
Weed Description: Perennial weed primarily of turfgrass found throughout the continental United States.
Seedlings: Cotyledons resemble a grass emerging, are linear and smooth.
Leaves: All leaves are in a basal rosette. Leaves are linear to lanceolate (5-25 cm long by 1-2.5 cm wide) with veins running the length of the leaf, may be sparsely hairy or without hairs.
Flowers: A spike that is unbranched and leafless to 10 cm long and contains many inconspicuous flowers.
Fruit: A 2-seeded capsule, 3-4 mm long.Roots: Fibrous roots from a short taproot.
Identifying Characteristics: Narrow, linear leaves from a basal rosette with characteristic flowering spikes typical of a plantain.