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Montana Field Guide

Montana Field Guides

Yellow Evening Primrose - Calylophus serrulatus
Other Names:  Oenothera serrulata


Global Rank: G5
State Rank: S3?

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

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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
Present
 


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).

Summary of Observations Submitted for Montana
Number of Observations: 7

(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
Often sandy or gravelly soil of grasslands; plains (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).)

References
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Citation for data on this website:
Yellow Evening Primrose — Calylophus serrulatus.  Montana Field Guide.  .  Retrieved on , from