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Montana Field Guide

Montana Field Guides

Prickly Rose - Rosa acicularis
Other Names:  Rosa sayi

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Native Species

Global Rank: G5
State Rank: SNR

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:
C-value: 4

External Links

 
General Description
Stems lax, 50–150 cm, densely to sparsely covered with fine, straight prickles; those at nodes similar. Leaves with 5 to 7, narrowly elliptic leaflets, pubescent on veins beneath,1.5–5 cm long; the rachis glabrate to glandular-pubescent; Flowers mostly solitary; hypanthium glabrous, 3–6 mm long; sepals 15–20 mm long, spreading, dilated at the tip, puberulent, sometimes stipitate-glandular, persistent in fruit; petals 15–30 mm long. Hip globose to pyriform, 1–2 cm long, reddish-purple (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Montana plants are subspecies sayi (Schwein.) W.H. Lewis.

Species Range
Montana Range

Year-round
 


Range Comments
Circumboreal south to BC, CO, NE, MN and VT (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 1089

(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
Moist to wet coniferous forest; valleys to lower subalpine (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

References
  • Additional ReferencesLegend:   View Online Publication
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    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
    • Martin, S.A. 1985. Ecology of the Rock Creek bighorn sheep herd, Beartooth Mountains, Montana. M.Sc. Thesis. Bozeman, MT: Montana State University. 152 p.
    • Miller, J.G. 1978. An ecoligical study of creeping juniper (Juniperus horizontalis Moench.) in Montana. M.Sc. Thesis. Bozeman, MT: Montana State University. 154 p.
    • Pallister, G.L. 1974. The seasonal distribution and range use of bighorn sheep in the Beartooth Mountains, with special reference to the West Rosebud and Stillwater herds. M.Sc. Thesis. Bozeman, MT: Montana State University. 67 p.
    • Wood, M.A. 1981. Small mammal communities after two recent fires in Yellowstone National Park. M.Sc. Thesis. Bozeman, Montana: Montana State University. 58 p.
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Citation for data on this website:
Prickly Rose — Rosa acicularis.  Montana Field Guide.  .  Retrieved on , from