Cirsium quercetorum
species of plant
Cirsium quercetorum is a species of thistle endemic to coastal California, its common names include brownie thistle and Alameda thistle.
Distribution
Cirsium quercetorum is endemic to the Outer California Coast Ranges from Santa Barbara's Point Conception north into the San Francisco Bay Area and up the North Coast as far as Humboldt County. This is a common plant found in coastal grasslands and open woodlands.
Description
The perennial Cirsium quercetorum plant usually grows clumped low to the ground, less than 20 cm (8 inches) tall, but occasionally the plant grows erect and can reach 90 cm (36 inches) in height. It has spiny lobed toothy leaves and spiny flower heads with brownish ivory-tan white to purple disc florets but no ray florets.
References
External links
Media related to Cirsium quercetorum at Wikimedia Commons
C. Michael Hogan ed. 2010. Cirsium quercetorum.
The public source identifies “Cirsium quercetorum” as species of plant. This brief keeps that definition visible, then builds a research path around Cirsium, quercetorum and species.
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The date and method of observation matter as much as the stated conclusion, especially where classification or consensus has changed. The source revision retrieved here is dated Jul 21, 2026. The linked authority identifier is Q5122074. None of the 0 selected statements returned an explicit reference. The first chronological checks are 2010.
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This entry incorporates text from “Cirsium quercetorum” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.