Publication: Bull. Torrey Bot. Club. 43: 612. 1917 (as sub-bracteata). 1917.
selected vouchers: WTU
Notes: FNA23 lists this as endemic to California. Several collections in WA from San Juan County by Peter Zika, and found in British Columbia by Frank Lomer. These records represent introductions and not disjunct native populations.
Carex subbracteata is very similar to and perhaps conspecific with C. gracilior (R. Whitkus 1988).