Search Field Guide
Advanced Search
MT Gov Logo
Montana Field Guide

Montana Field Guides

Yellow Evening Primrose - Calylophus serrulatus
Other Names:  Oenothera serrulata

Native Species

Global Rank: G5
State Rank: S3?

Agency Status
MNPS Threat Rank:
C-value: 4

External Links

General Description
Perennial subshrub with a woody, branched caudex. Stems ascending, 10–40 cm. Herbage strigose. Leaves all cauline, alternate, short-petiolate; blades simple, linear to oblanceolate, serrulate, 1–3 cm long with axillary fascicles of smaller leaves. Inflorescence: solitary, sessile flowers in axils of upper leaf-like bracts. Flowers 4-merous; hypanthium trumpet-shaped, 5–7 mm long; sepals 3–5 mm long; petals yellow, obovate, 7–10 mm long; stamens 8; stigma discoid, shallowly lobed. Fruit a sessile, linear, 4-loculate capsule15–25 mm long; seeds in 2 rows per locule (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Wagner et al. (2007: Syst. Bot. Monogr. Vol. 83) treat this as Oenothera serrulata Nutt.

Species Range
Montana Range


Range Comments
AB to MB south to AZ, NM, TX, MO and Mexico (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 43

(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)

Often sandy or gravelly soil of grasslands; plains (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?
    • Fritzen, D.E. 1995. Ecology and behavior of Mule Deer on the Rosebud Coal Mine, Montana. Ph.D. Dissertation. Bozeman, MT: Montana State University. 143 p.
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
    • Seipel, T.F. 2006. Plant species diversity in the sagebrush steppe of Montana. M.Sc. Thesis. Bozeman, MT: Montana State University. 87 p.
  • Web Search Engines for Articles on "Yellow Evening Primrose"
Login Logout
Citation for data on this website:
Yellow Evening Primrose — Calylophus serrulatus.  Montana Field Guide.  .  Retrieved on , from