[Carex artitecta Mack., moreCarex artitecta var. subtilirostris F.J.Herm., Carex emmonsii var. muehlenbergii (A.Gray ex Torr.) Rettig, Carex nigromarginata var. muehlenbergii (A.Gray ex Torr.) Gleason, Carex varia Host]
Stems firm, erect, 2-5 dm, evidently surpassing the lvs; staminate scales ±blunt, the midrib distally weak or fading out; ±calciphile; Mass. to S.C., w. to Mich., Io., Nebr., and Okla. (C. artitecta; C. pensylvanica var. muhlenbergii; C. nigromarginata var. m.)
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.