OF THE CAROLINAS & GEORGIA

Spermatophytes (seed plants): Angiosperms (flowering plants): Eudicots: Core Eudicots: Rosids: Fabids: Malpighiales

WEAKLEY'S FLORA OF THE SOUTHEASTERN US (4/24/22):
Hypericum perforatum   FAMILY Hypericaceae   Go to FSUS key


SYNONYMOUS WITH PLANTS NATIONAL DATABASE:
Hypericum perforatum   FAMILY Clusiaceae

SYNONYMOUS WITH Flora of North America
Hypericum perforatum ssp. perforatum

SYNONYMOUS WITH VASCULAR FLORA OF THE CAROLINAS (Radford, Ahles, & Bell, 1968) 126-01-026:
Hypericum perforatum   FAMILY Hypericaceae

SYNONYMOUS WITH Manual of the Southeastern Flora (Small, 1933, 1938)
Hypericum perforatum

 

COMMON NAME:
European St. Johnswort, Common St. Johnswort, Klamath-weed


         To see larger pictures, click or hover over the thumbnails.

image of Hypericum perforatum, European St. Johnswort, Common St. Johnswort, Klamath-weed

USDA-NRCS PLANTS Database / Britton, N.L., and A. Brown. 1913    pnd_hype_001_lvd

        

image of Hypericum perforatum, European St. Johnswort, Common St. Johnswort, Klamath-weed

Tim Spira    tpshperforatum2

June        

image of Hypericum perforatum, European St. Johnswort, Common St. Johnswort, Klamath-weed

Tim Spira    tpshperforatum2_2

June        

Leaves sessile, with translucent dots that look like "windows", per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians.

image of Hypericum perforatum, European St. Johnswort, Common St. Johnswort, Klamath-weed

JK Marlow    jkm090707_010

July    Avery County    NC

The Roan Highlands

image of Hypericum perforatum, European St. Johnswort, Common St. Johnswort, Klamath-weed

JK Marlow    jkm090707_015

July    Avery County    NC

The Roan Highlands

Numerous flowers borne in a compound cyme, per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians.

image of Hypericum perforatum, European St. Johnswort, Common St. Johnswort, Klamath-weed

JK Marlow    jkm090707_016

July    Avery County    NC

The Roan Highlands

Flowers 3/4"-1" wide, with black "stitching" on the margins of petals, per Wildflowers of the Southern Mountains.

image of Hypericum perforatum, European St. Johnswort, Common St. Johnswort, Klamath-weed

JK Marlow    jkm090707_020

July    Avery County    NC

The Roan Highlands

Five petals, to 0.4" long, black-dotted near the margin, per Wildflowers of Tennessee.

 

WEAKLEY'S FLORA OF THE SOUTHEASTERN US (4/24/22):
Hypericum perforatum   FAMILY Hypericaceae

SYNONYMOUS WITH PLANTS NATIONAL DATABASE:
Hypericum perforatum   FAMILY Clusiaceae

SYNONYMOUS WITH Flora of North America
Hypericum perforatum ssp. perforatum

SYNONYMOUS WITH VASCULAR FLORA OF THE CAROLINAS (Radford, Ahles, & Bell, 1968) 126-01-026:
Hypericum perforatum   FAMILY Hypericaceae

SYNONYMOUS WITH Manual of the Southeastern Flora (Small, 1933, 1938)
Hypericum perforatum

 

Find by SCIENTIFIC NAME:

725

Forb
Perennial

Non-native: Europe

Common (rare in Coastal Plain)

Habitat: Fields, pastures, roadsides, woodland borders, per Weakley's Flora

map
Click here to see a map, notes, and images from Weakley's Flora of the Southeastern US.

Click here to see a map showing all occurrences known to SERNEC, a consortium of southeastern herbaria. (Zoom in to see more detail.)


Invasive?

This plant may be causing problems in natural areas outside its native range, according to authorities such as:

 

LEAVES:
Simple
Opposite

FLOWER:
Summer/Fall
Yellow
Bisexual
Radially symmetrical
5 persistent sepals
5 petals
Superior ovary

FRUIT:
Summer/Fall
Capsule

 

TO LEARN MORE about this plant, look it up in a good book!



 


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