State Rank Reason (see State Rank above)
A rare species in Montana, known only from a few occurrences from Lake County.
Rhizomatous. Stems erect, 50–80 cm. Leaves basal and cauline; blades 3–12 mm wide. Inflorescence of 5 to 8 short-pedunculate spikes; the lowest bract greater than the inflorescence. Spikes unisexual, erect ascending; the uppermost 1 to 4 male, narrow, 2–3 cm long; the lower female, 2–6 cm long, cylindric. Perigynia ascending, green, broadly lanceoloid, inflated, glabrous, 5–7 mm long tapered to an indistinct beak ca. 1 mm long; stigmas 3. Female scales acute to acuminate, tan with a pale midstripe and margins, awned, smaller than the perigynia. Achene 3-sided, much smaller than the perigynium (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX)
Marshes and fens.