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Montana Field Guide

Montana Field Guides

Black-girdle Bulrush - Scirpus atrocinctus

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Status Under Review
Native Species

Global Rank: G5
State Rank: SNR
C-value: 4

Agency Status


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General Description
Densely caespitose. Stems 30–80 cm, clustered on short rhizomes. Leaves: blades 2–4 mm wide; basal sheaths brown. Inflorescence open-cymose; nearly all spikelets pedunculate. Spikelets 3–5 mm long. Scales 1.5–2 mm long, reddish-brown to black with a green midvein, tip rounded, sometimes apiculate. Flowers: bristles 6, contorted, smooth, white, longer than the scales; stigmas 3. Achene 2- or 3-sided, whitish, 0.5–1 mm long (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Range Comments
NT south to WA, WY, SD, IL and WV. Known from Lincoln and Sanders counties (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).


  • Literature Cited AboveLegend:   View Online Publication
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
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Citation for data on this website:
Black-girdle Bulrush — Scirpus atrocinctus.  Montana Field Guide.  .  Retrieved on , from