Carex amphibola perennial, tufted, to 80 cm, often less, stem ca 0.2 cm wide, sharply 3-sided, bases brownish, plant light green, leafy stemmed.
Leaves broad, 0.4-0.8 cm wide; bracts leafy with well developed sheath, usually longer than inflorescence.
Flower spikes pale, terminal spike male, usually longer than uppermost female spikes, female spikes 2-5, few flowered, about 1.5 cm long, 0.5 cm wide, separate, stalked (except top-most), perigynium about 0.5 cm, egg-shaped, bead-like, beakless, scales narrow with awn barely projecting beyond rounded top of perigynium, achenes 3-sided with slightly concave sides; blooming and fruiting May-July.
Wetland status: FAC.
Frequency in NYC: Infrequent.
Habitat: Open moist or wet soil, pond edges, trail margins in moist woods, soil pH 5.9-7, tolerant of fire and shade, moderately tolerant of anaerobic soil, intolerant of drought and salt (USDA, NRCS 2010).