11. E. rostellata, Torr. _Culms flattened and striate-grooved_, wiry, erect (1--21/2 deg. high), _the sterile ones reclining, rooting and proliferous_ from the apex (1--2 deg. high), the sheath transversely truncate; _spikelet spindle-shaped_, 12--20-flowered; scales ovate, obtuse (light-brown); achene obovate-triangular, narrowed into the confluent pyramidal tubercle, which is overtopped by the 4--6 bristles.--Marshes, N. Eng. to S. C., west to Mich. and Ky.

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