2b. var. obtusata

Pl. 136 a, b

S. obtusata var. lobata (Trin.) Scribn.

Inflorescences dense and narrow at maturity, the branches ascending. Rachilla with the joint between the glumes and the lowermost floret mostly 0.5–0.7 mm long. Upper glume 2–3 times as long as the width in side view (from midnerve to margin), obovate, the tip broadly rounded to nearly truncate. 2n=14. April–July.

Scattered to common throughout the state (U.S., Canada, Alaska, Mexico, Caribbean Islands). Bottomland forests, mesic to dry upland forests, upland prairies, glades, ledges and tops of bluffs, banks of spring branches, streams, and rivers, and margins of ponds and sinkhole ponds; also roadsides, railroads, old fields, pastures, and disturbed, open areas.