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Montana Field Guide

Montana Field Guides

Rice Cutgrass - Leersia oryzoides

Native Species

Global Rank: G5
State Rank: S3S4
(see State Rank Reason below)

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:
C-value: 8

External Links






State Rank Reason (see State Rank above)
Leersia oryzoides is widespread in the United States (FNA 2007). In Montana herbarium collections are few, though it can be common along parts of the Missouri, and is overlooked as it is often aquatic and growing in inaccessible areas or within dense stream-side vegetation. It tolerates some disturbance and disperses itself when its sticky hairs cling to passing Leersia oryzoides is widespread in the United States (FNA 2007). In Montana herbarium collections are few, though it can be common along parts of the Missouri, and is overlooked as it is often aquatic and growing in inaccessible areas or within dense stream-side vegetation. It tolerates some disturbance and disperses itself when its sticky hairs cling to passing animals.
  • Details on Status Ranking and Review
    Rice Cutgrass (Leersia oryzoides) Conservation Status Review
    Review Date = 09/13/2017
    View State Conservation Rank Criteria
    Range Extent

    ScoreF - 20,000-200,000 sq km (~8,000-80,000 sq mi)

    Area of Occupancy

    ScoreC - 3-5 4-km2 grid cells

    Number of Populations

    ScoreA - 1 - 5

    Number of Occurrences or Percent Area with Good Viability / Ecological Integrity

    ScoreA - No occurrences with excellent or good (A or B) viability or ecological integrity

    Threats

    ScoreD - Low

    CommentThreat category includes: Recreational activities.

 
General Description
Cool season, rhizomatous perennial. Stems 80–160 cm, solitary to bunched, often rooting at nodes. Leaves: blades 7–14 mm wide, flat and lax; sheaths retrorsely scabrous with overlapping margins; ligules membranous, truncate, 0.8–1 mm long. Inflorescence an open panicle 10–25 cm long. Spikelets 4–5 mm long, with one floret; glumes lacking. Lemma bristly, awnless; palea equaling lemma and tightly clasped within it. Disarticulation above the glumes; dispersal unit the floret (Lavin in Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range
Present
 


Range Comments
Widespread but only locally common throughout most of North America except at extreme northern latitudes (Lavin in Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 10

(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

References
  • Literature Cited AboveLegend:   View Online Publication
    • Cronquist, A., A. H. Holmgren, N. H. Holmgren, J. L. Reveal, and P. K. Holmgren. 1977. Intermountain flora: Vascular Plants of the Intermountain West, U.S.A. Volume 6: The Monocotyledons. New York, NY: Columbia University Press. 584 pp.
    • Great Plains Flora Association (McGregor, R.L., coordinator, and T.M. Barkley, R.E. Brooks, and E.K. Schofield - eds.). 1986. Flora of the Great Plains. Lawrence, KS: Univ. Press Kansas. 1392 pp.
    • 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?
    • Britton, N. L. and A. B. Brown. 1913. An Illustrated Flora of the Northern United States, Canada, and the British Possessions. 2nd Edition in 3 Volumes. New York, NY: Charles Scribner's Sons. B13BRI01PAUS.
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Citation for data on this website:
Rice Cutgrass — Leersia oryzoides.  Montana Field Guide.  .  Retrieved on , from