Publication: Bull. Torrey Bot. Club. 43: 606. 1917.
selected vouchers: WTU
Notes: Treated as a synonym of C. petasata by H&C.
FNA23: "Carex constanceana, known from only one locality, has not been collected since the early 1900s. It has features of C. petasata and of C. davyi. In one flora C. constanceana was included in C. petasata (A. Cronquist 1969)."