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Three-square Bulrush - Schoenoplectus americanus
Other Names:
Scirpus americanus
Native Species
Global Rank:
G5
State Rank:
S5
C-value:
6
Agency Status
USFWS:
USFS:
BLM:
External Links
General Description
Stems 40–150 cm, 3-sided with concave sides. Leaf blades short, flat or folded, 2–8 mm wide. Inflorescence compact, of 2 to 15 sessile spikelets. Spikelets 6–15 mm long. Scales 3–4 mm long, glabrous, reddish to purplish-brown; awn ca. 0.5 mm long. Flowers: bristles 5 or 6, ca. as long as achene; stigmas 2 or 3. Achene 2- or 3-sided with rounded edges, brown, ca. 3 mm long (
Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).
Species Range
Montana Range
Range Descriptions
Native
Range Comments
Known from Beaverhead and Madison counties. BC to NS south to CA, AZ, NM, TX MS, FL, Mexico and S. America (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).
Observations in Montana Natural Heritage Program Database
Number of Observations: 40
(Click on the following maps and charts to see full sized version)
Map Help and Descriptions
Relative Density
Recency
(Observations spanning multiple months or years are excluded from time charts)
Habitat
Stewardship Responsibility
References
- 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.
- Additional ReferencesLegend: View Online Publication
Do you know of a citation we're missing?
Baril, S.F. 1977. Benthic invertebrate distribution, abundance, and diversity in Rosebud Creek, Montana. M.Sc. Thesis. Bozeman, MT: Montana State University. 97 p.- Boggs, K. W. 1984. Succession in riparian communities of the lower Yellowstone River, Montana. M.S. Thesis. Montana State University, Bozeman, 107 pp.
- Fritzen, D.E. 1995. Ecology and behavior of Mule Deer on the Rosebud Coal Mine, Montana. Ph.D. Dissertation. Bozeman, MT: Montana State University. 143 p.
- Lesica, P., M.T. Lavin, and P.F. Stickney. 2022. Manual of Montana Vascular Plants, Second Edition. Fort Worth, TX: BRIT Press. viii + 779 p.
- McCarthy, J.J. 1973. Response of nesting Canada geese (Branta canadensis) to islands in stockdams in northcentral Montana. M.Sc. Thesis. Bozeman, MT: Montana State University. 36 p.
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