Parry's Oatgrass - Danthonia parryi
(see State Rank Reason below)
MNPS Threat Rank
State Rank Reason (see State Rank above)
Danthonia parryi is endemic to western North America (FNA 2003). Parry's oatgrass is considered to be a major component of grasslands on the eastern foothills of the Rocky Mountains. In Montana it is considered to be fairly common along the Rocky Mountain Front and is reported for the Greater Yellowstone Ecosystem (FNA 2003), yet there are relatively few documented occurrences. This grass could be under-collected and/or easily misidentified. Current information on locations, population sizes, and threats is needed.
- Details on Status Ranking and Review
ScoreE - 5,000-20,000 sq km (~2,000-8,000 sq mi)
Area of Occupancy
ScoreD - 6-25 4-km2 grid cells
Number of Populations
ScoreB - 6 - 20
Number of Occurrences or Percent Area with Good Viability / Ecological Integrity
ScoreC - Few (4-12) occurrences with excellent or good viability or ecological integrity
ScoreC - Moderate. Generalist or community with some key requirements scarce
ScoreD - Low
CommentNo known threats.
PLANTS: A herbaceous, perennial grass with culms of 30–70 cm in height.
LEAVES: Blades are 2–3 mm wide with essentially hairless sheaths, hairy collars (typically), and ligules of 0.5–1 mm length (Lesica et al. 2012).
INFLORESCENCE: A contracted panicle or raceme of 3–7 cm length with 4 to 10 spikelets. Spikelets are 17–22 mm long with 4 to 6 florets. Lemmas are tightly enfolded by glumes of 7–10 mm length, long-hairy over the entire back, and with awns 12–14 mm length (Lesica et al. 2012). It rarely produces grain (fruits or caryopses) in the terminal inflorescence (FNA 2003).
AK south to SK and NM (Lavin in 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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Map Help and Descriptions
(Observations spanning multiple months or years are excluded from time charts)
Dry mountain meadows (Lesica et al. 2012). Open grassland, open woods, and rock slopes at elevations up to 4,000 meters (FNA 2003).
It is speculated that Danthonia parryi may have been derived from hybridization between Danthonia californica and Danthonia intermedia because it has intermediate morphology and rarely produces fruit (grain) in the terminal inflorescence (FNA 2003).
- Literature Cited AboveLegend: View Online Publication
- Flora of North America Editorial Committee. 2003. Flora of North America North of Mexico. Vol. 25. Magnoliophyta: Commelinidae (in part): Poaceae, part 2. Oxford Univ. Press, New York. xxv + 781 pp.
- Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.