Calflora Taxon Report
Carduus tenuiflorus Curtis
Italian thistle, Slender flowered thistle, Winged plumeless thistle
Carduus tenuiflorus is an annual herb that is not native to California.
Cal-IPC rating: limited

Alternate Names and Sources:
None
Siskiyou Del Norte Modoc Humboldt Shasta Lassen Trinity Plumas Tehama Butte Mendocino Glenn Sierra Yuba Lake Nevada Colusa Placer Sutter El Dorado Yolo Alpine Napa Sonoma Sacramento Mono Amador Solano Calaveras Tuolumne San Joaquin Marin Contra Costa Alameda Santa Cruz Mariposa Madera San Francisco San Mateo Merced Fresno Stanislaus Santa Clara Inyo San Benito Tulare Kings Monterey San Bernardino San Luis Obispo Kern Santa Barbara Ventura Los Angeles Riverside Orange San Diego Imperial
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Bloom Period
redone or more occurrences
within a 7.5-minute quadrangle
The blue points on the map indicate observations in Calflora.
Click on the map to view observations within a specific county.


Accepted by: JEPS + PLANTS + POWO
Jepson eFlora section:
eudicot
USDA PLANTS group:
Dicot

[Wikipedia] Origins: [Wikipedia] Carduus tenuiflorus is native to western North Africa in: northern Algeria; Morocco; and Tunisia, and much of Europe in: Belgium; France, including Corsica; Ireland; Italy, including Sardinia and Sicily; the Netherlands; Portugal, Spain, including the Baleares (Balearic Islands); and the United Kingdom. It has become naturalised in Macaronesia, South Africa, India, Australasia, Southern South America, regions of the United States, and elsewhere. It is an invasive species in California. (link added by Jessica Johnston)

Suggested Citation
“Calflora - Taxon Report.” The Calflora Database, a non-profit organization. .

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