Carex tonsa var. rugosperma
Novon 6: 118. 1996.
Leaf-blades bright green, much longer than culms, herbaceous, scabrous to papillose adaxially. Perigynia pubescent on beak and body.
Phenology: Fruiting mid Apr–late Jun.
Habitat: Open, dry, acidic, sandy and rocky meadows, roadsides, dunes, ridges, heathlands, savannas, pine, oak, and poplar woodland edges
Elevation: 50–1000 m
Man., N.S., Ont., Que., Sask., Conn., Ga., Ill., Ind., Maine, Md., Mass., Mich., Minn., N.H., N.J., N.Y., N.C., Ohio, Pa., S.C., Vt., W.Va., Wis.
Carex tonsa var. rugosperma has long been known as C. rugosperma but C. tonsa has priority. The two varieties of C. tonsa may occur together; intermediates are found occasionally. Plants with virtually glabrous perigynia may have long, scabrous leaves. Plants with a pubescent perigynia apparently never have coriaceous, short, and nearly smooth leaves.