Search Field Guide
Advanced Search
MT Gov Logo
Montana Field Guide

Montana Field Guides

Tufted Evening-primrose - Oenothera caespitosa
Other Names:  Oenothera cespitosa

Native Species

Global Rank: G5
State Rank: S5

Agency Status
MNPS Threat Rank:
C-value: 4

External Links

General Description
Acaulescent perennial with a simple or branched caudex surmounting a taproot. Herbage strigose. Leaves oblanceolate, 2–15 cm long with entire to serrate margins. Flowers white, opening at night, turning pink the following morning; hypanthium 2–8 cm long; sepals 1–3 cm long; petals 15–35 mm long; stigma lobes 3–6 mm long. Capsule erect, narrowly ovoid to ellipsoid, 12–40 mm long, woody, vaguely 4-angled, usually bumpy, sometimes pedicellate, often partly below ground (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Our plants are subspecies caespitosa.

Species Range
Montana Range


Range Comments
WA to SK, south to CA, NM, TX and Mexico (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 111

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density



(Observations spanning multiple months or years are excluded from time charts)

Sandy or clay, usually sparsely-vegetated soil of open slopes, badlands, sandhills, roadsides; plains, valleys to subalpine (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

  • Additional ReferencesLegend:   View Online Publication
    Do you know of a citation we're missing?
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
    • Mackie, R.J. 1965. Range ecology and relationships of mule deer, elk, and cattle in the Missouri River breaks. Ph.D Dissertation. Bozeman, MT: Montana State University. 229 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.
  • Web Search Engines for Articles on "Tufted Evening-primrose"
Login Logout
Citation for data on this website:
Tufted Evening-primrose — Oenothera caespitosa.  Montana Field Guide.  .  Retrieved on , from