Robert W. Freckmann Herbarium


  Hypericum perforatum L. image
Photographer: Merel R. Black           

Botanical Illustration

Botanical Illustration

Botanical Illustration

Botanical Illustration

Damon A. Smith

Emmet J. Judziewicz

Michael Clayton

Margery Melgaard

Merel R. Black

Merel R. Black

Christopher Noll
Family Hypericaceae
Hypericum perforatum L.
common St. John's-wort, Klamath-weed, St. John's-wort
Hypericum: ancient Greek name derived from hyper, "above," and eikon, "picture," from old practice of placing flowers above an image in the house to ward off evil spirits at the midsummer festival of Walpurgisnacht, which later became feast of St. John
perforatum: perforated, with the paired leaves joined at the base and thus 'perforated' by the stem
Hazardous hazard symbol- click for definition   Invasive - Eradicate!  Stop It symbol- click for definition
County distribution map- click for detailed distribution maps.
Detailed Distribution:
Town Range Maps
Google Dot Maps
Status: Introduced - naturalized; ecologically invasive
Plant: erect, perennial, 2'-3' tall forb with many leafy branches; stems with a sharp ridge below the base of the leaves
Flower: yellow, 5-parted, 5/8"-1" wide, stalked, petals with black dots near the edges; inflorescence a many-flowered, rounded to flat, compound, branched cluster (cyme); blooms June-Sept.
Fruit:3 chambered capsule fruit drawing
Leaf:stalkless, small, 1/4" wide leaf drawing
Habitat: disturbed sites, fields, roadsides
(Glossary)

More Information Natural Communities Herbarium Specimens
All Hypericum list Ethnobotany Information Google- Images or Text
Synonyms 
There are no synonyms for this taxon.

         
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