Search Field Guide
Advanced Search
MT Gov Logo
Montana Field Guide

Montana Field Guides

Western St. John's-wort - Hypericum scouleri
Other Names:  Hypericum formosum

Native Species

Global Rank: G5
State Rank: SNR

Agency Status
MNPS Threat Rank:
C-value: 7

External Links

General Description
Rhizomatous and stoloniferous. Stems erect, 5–60 cm. Leaves broadly elliptic, 5–30 mm long, black-dotted on the margins. Flowers: petals 6–12 mm long with black-dotted margins; sepals ovate with rounded tips and amber veins, 3–4 mm long. Capsule 5–7 mm long with yellow to brown seeds (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

We have subspecies scouleri and nortoniae (M.E. Jones) J. Gillett.

Species Range

Range Comments
Alberta, Montana, South to New Mexico; west to Pacific coast.

Observations in Montana Natural Heritage Program Database
Number of Observations: 57

(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)

Moist to wet, often shallow soil of meadows, streambanks, ledges; valleys to alpine (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Login Logout
Citation for data on this website:
Western St. John's-wort — Hypericum scouleri.  Montana Field Guide.  .  Retrieved on , from