Taxon  Report   7622 
Silybum marianum  (L.) Gaertn.
Blessed milkthistle,  Milk thistle
Silybum marianum
© 2005 Luigi Rignanese
CalPhotos: click on a
photo to see it bigger
Silybum marianum
© 2005 Luigi Rignanese
Silybum marianum
© 2004 Carol W. Witham
Silybum marianum, a dicot, is an annual or perennial herb that is not native to California; it was introduced from elsewhere and naturalized in the wild.
It is an invasive plant. The California Invasive Plant Council classifies its potential impact on native ecosystems as limited (plant profile / CalWeedMapper).

Interactive Distribution Map


Observation Hotline
(observation details + photos)



point, line, or polygon

one or more occurrences
within a 7.5-minute quadrangle

Plant Characteristics
and Associations



Bloom Period
Silybum marianum
© 2006 Dr. Amadej Trnkoczy
Family: ASTERACEAE  
Genus: Silybum
Communities:
weed, characteristic of disturbed places
Habitat: disturbed [Walker]
Name Status:
Accepted by TJM2 + PLANTS + JM93
Alternate Names:
(according to)

PLANTS: Carduus marianus
PLANTS: Mariana mariana
More information about  Silybum marianum
Photos on CalPhotos / Google Images
Photos and ID tips from PlantID.net

Jepson eFlora

Records from the Consortium of California Herbaria

Original Publication citation (ITIS)

USDA PLANTS Profile (SIMA3)

Search the International Plants Names Index

Search efloras.org (Flora of North America)

website references from Google


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 California Herbaria.
[web application]. 2016. Berkeley, California: The Calflora Database [a non-profit organization].
Available: http://www.calflora.org/   (Accessed: Aug 30, 2016).

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