1a. var. latisquama (A. Gray) Cronquist

B. latisquama A. Gray

Pl. 231 f–h

Plants with slender rhizomes and often also basal offshoots. Involucral bracts awl-shaped to oblanceolate, rounded or bluntly and broadly angled at the tip, sometimes with an abrupt, short, sharp point, the outer series 2.5–3.5 mm long, 0.9–1.6 mm wide, the inner series 3.2–4.0 mm long, 0.9–1.3 mm wide. 2n=18. July–October.

Scattered in the northern and southwestern portions of the state but apparently absent from the western portion of the Glaciated Plains Division and nearly absent from the Ozarks (North Dakota to Oklahoma east to Wisconsin and Arkansas; introduced in New England). Banks of streams and rivers, margins of ponds and lakes, bottomland prairies, bottomland forests, sloughs, fens, and marshes, also margins of crop fields, fallow fields, levees, banks of ditches, railroads, roadsides, and moist, sandy, disturbed areas.