Eleocharis flavescens is a perennial spike rush, tufted, 30 cm to 1.5 m tall, sheaths white, membranous at top;
Leaves bladeless, sheaths only.
Flower spikelets egg-shaped, 0.2-0.7 cm, fewer than 20 scales, scales with brown margins.
Fruit a dry achene, red-brown to blackish, lens-shaped, 0.1 cm, tubercle pale, cone-shaped, base swollen much smaller than top of achene; May-Sept.
Wetland status: OBL.
Frequency in NYC: Very infrequent.
Habitat: Wet sand of coastal plain, soil pH 4.5-7 (USDA, NRCS 2010).