Taxon  Report   4312 
Hypericum perforatum  L.
Klamath weed, Klamathweed, common St. Johnswort
Hypericum perforatum, a dicot, is a perennial herb that is not native to California; it was introduced from elsewhere and naturalized in the wild.

The California Invasive Plant Council classifies its potential impact on native ecosystems as moderate (plant profile).

 

 Interactive Distribution Map 


 Observation Hotline 
 (observation details + photos)



 Distribution by County 


© 2005 Louis-M. Landry

© 2006 Dr. Amadej Trnkoczy
 Plant Characteristics
 and Associations



Bloom Period

© 2008 Keir Morse
Communities: weed, characteristic of disturbed places
Habitat: disturbed, disturbed [Walker]
Family: HYPERICACEAE   (PLANTS: CLUSIACEAE)
Genus: Hypericum
Subspecies and Varieties:
Hypericum perforatum ssp. perforatum
Add an Observation of Hypericum perforatum
Name Status:
Accepted by TJM2 + PLANTS + JM93
 
 Information about  Hypericum perforatum  from other sources:
Photos on Picasa / Flickr / Google Images

website references on Google

USDA PLANTS Profile (HYPE)

2012 Jepson Manual Treament from the Jepson Herbarium,
University of California, Berkeley

Original Publication citation. on the International Plants Names Index

Search efloras.org (Flora of North America)

Suggested Citation
Calflora: Information on California plants for education, research and conservation,
with data contributed by public and private institutions and individuals, including the Consortium of Calif. Herbaria.
[web application]. 2014. Berkeley, California: The Calflora Database [a non-profit organization].
Available: http://www.calflora.org/   (Accessed: Apr 23, 2014).

The information on this page comes from diverse sources. None of the links are sponsored.

Applications About Calflora Search for Plants
Calflora  -  1700 Shattuck Avenue   #198,   Berkeley, CA   94709  -  510 883-3148  -  CONTACT