Sphenopholis obtusata (Michx.) Scribn.
Habitat: Moist meadows, stream banks, and shores of ponds or lakes.
Range: Maine, south to Florida, west to California, north to British Columbia.
Aids to Identification: Prairie wedgegrass, or prairie wedgescale, is a solitary annual or short-lived perennial grass. Like other Sphenopholis species, S. obtusata has 2-flowered spikelets bearing a prolonged rachilla behind the upper palea. In S. obtusata, the spikelets are 3-4.2 mm long and the lowest rachilla segment is 0.5-0.7 mm long. The anthers are 0.5-0.8 mm long. The leaves are mostly 2-8 mm wide and under 10 cm long.
Ecological characteristics: None noted.
Phenology: Flowers May - July.
Synonyms: Former names include Eatonia obtusata Gray; Sphenopholis obtusata (Michx.) Scribn. var. lobata (Trin.) Scribn.
Known Distribution in Maine: This rare plant has been documented in the following county: York.
Reason(s) for rarity: At northern limit of range.