Crawe's Sedge - Carex crawei
State Rank Reason (see State Rank above)
Rare in Montana, where it is known from several areas. A few sites contain moderate to large populations. Trend data are lacking for the species. Negative impacts to populations from hydrologic changes are a potential threat.
Rhizomatous. Stems erect, 5–20 cm. Leaves basal and cauline; blades 1–4 mm wide. Inflorescence of 2 to 5 well-separated spikes; the lowest bract shorter than the inflorescence. Spikes ascending; the uppermost male, 1–2 cm long; the lower female, 8–20 mm long, pedunculate, sometimes arising from the base. Perigynia spreading to ascending, green to tan, glabrous, ovoid, 2.5–3.5 mm long with an obscure beak; stigmas 3. Female scales ovate, tan with pale margins and a green midvein, shorter and narrower then the perigynia. Achene 3-sided, partly filling the perigynium (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX)
The fruit matures in July.
Carex is a large genus in Montana; the following collection of characters separate Crawe's sedge from others in the state. Crawe's sedge has 3-sided achenes and a slender, terminal male spike less than 20 mm long. It has erect, rather than spreading or drooping, female spikes, and the glabrous, yellow-green perigynia do not have distinct beaks. Of the similar species, Carex livida has whitish perigynia and always grows in peat, and both Carex lanuginosa and C. lasiocarpa have hairy perigynia.
BC to NL south to WA, UT, WY, OK, AL and GA (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).
Observations in Montana Natural Heritage Program Database
Number of Observations:
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(Observations spanning multiple months or years are excluded from time charts)
Crawe's sedge grows in wet, gravelly or sandy soil along streams or pond margins, often where there is some natural wave or flow disturbance. It occurs in the valleys and montane foothills, especially where the dominant parent material is calcareous. Common associates include Carex oederi, C. lanuginosa, C. aurea, Juncus balticus, and Potentilla fruticosa.
Crawe's sedge often occupies early successional, riparian habitats that may require flooding to prevent development of soil and vegetation.
This species' response to livestock grazing or trampling is unknown. Crawe's sedge may be vulnerable to alterations in natural disturbance regimes or hydrology as well as developments, such as road construction, that tend to occur in valley bottoms.
- Additional ReferencesLegend: View Online Publication
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- Heidel, B. 1993. MTNHP sensitive plant surveys of BLM scattered tracts in the Great Falls Resource Area.
- Heidel, B.L. 1994. Survey for Psoralea hypogaea in the Great Falls Resource Area, Lewistown District. Unpublished report to the Bureau of Land Management, Montana. Montana Natural Heritage Program, Helena, Montana. 22 pp. plus appendices.
- Hermann, F. J. 1970. Manual of the Carices of the Rocky Mountains and Colorado Basin. Agricultural Handbook No. 374. USDA Forest Service. 397 pp.
- Lesica, P. 1991. The Rare Vascular Plants of Pine Butte Swamp Preserve. Unpublished Report to the Nature Conservancy. 15 Pp.
- Lesica, P. and J. S. Shelly. 1988. The vegetation and flora of glaciated prairie potholes on the Blackfeet Indian Reservation, Montana: Progress report. Unpublished report to the Montana Nature Conservancy, Helena, MT. 19 pp.
- Lesica, P., M. T. Lavin, and P. F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.