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Alameda County thistle
Cirsium quercetorum
Cirsium quercetorum
Alameda County thistle Aster Family
Cirsium quercetorum Asteraceae
common name
  Alameda County thistle
accepted scientific name
  Cirsium quercetorum (A. Gray) Jeps.
rules for finding collection records
  Cirsium quercetorum (316)
family name
Image Author: ©2014 Zoya Akulova
Image License: CC BY-NC
Image Source

Category: Wildflowers
Flowers: No obvious petals, Many petals
Petal colors: color
Flower size is 1.0 to 2.0 inches
Leaf: Alternate
Plant Observed 3rd week of March thru 1st week of August

How Likely at this Location (14%)
Name Match (100%)
Plant Showiness (63%)
base map where plant found
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Native Plant Status
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native Native
native Not Present

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