Classification
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All Names

  • Scientific Names
    • Carduus pycnocephalus
  • English
    • Italian thistle
    • Plymouth Thistle

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Recent observations

Photos / Sounds

What

Italian thistle Carduus pycnocephalus

Observer

mytilludie

Date

June 25, 2014

Photos / Sounds

Square

What

Italian thistle Carduus pycnocephalus

Observer

phildkim

Date

May 20, 2014 06:22 PM PDT

Place

brand park (Google, OSM)

Description

Carduus pycnocephalus “Italian thistle” is a European annual weed of disturbed sites. While most thistles have inforescence heads borne singly, in this species several are clustered at the stem tip. Although present for many decades in Northern Cailfornia, it is a recent invader into the watershed, first reported in 1967.

Photos / Sounds

Square

What

Italian thistle Carduus pycnocephalus

Observer

kueda

Date

June 16, 2014 01:37 PM PDT

Photos / Sounds

14169344957_d0421ea9f0_s

What

Italian thistle Carduus pycnocephalus

Observer

jaykeller

Date

June 3, 2014 12:11 PM PDT

Photos / Sounds

Square

What

Italian thistle Carduus pycnocephalus

Date

June 1, 2014 10:32 AM PDT

Photos / Sounds

Square

What

Italian thistle Carduus pycnocephalus

Observer

rstapornkul

Date

May 27, 2014 07:46 AM PDT

Description

Common name: Italian thistle
Scientific Name: Carduus pycnocephalus
Time of Observation: 7:46:27
Date: 2014-05-27
Weather: Sunny, no wind
Temperature: 18 C
Location: Eaton Canyon Park, Pasadena, CA, US

Habitat: Alluvial savannah
Slope: flat terrain/depression surrounded by slight slope
Sun: complete exposure to sunlight
Water: no surrounding water seen
Soil: alluvial- sandy, gravelly soils

NOTES:
The Italian thistle was found off the main walking trail in a dry, desert-like, and alluvial area filled with stones. The invasive species often found in disturbed areas in soils with relatively high pH is spiny towards the tips. No flowers were seen on the plant during this summer season.

Photos / Sounds

No photos or sounds

Observer

hasz

Date

May 10, 2014

Place

Peters Dam East (Google, OSM)

Description

confer-harwood forest, forest edge
Northwest facing slope
Height 3'-4'
Flowering, purple flowers, clustered heads
101-1000 plants

Photos / Sounds

Square

What

Italian thistle Carduus pycnocephalus

Observer

euproserpinus

Date

May 22, 2014 07:25 PM PDT

Photos / Sounds

Square

What

Italian thistle Carduus pycnocephalus

Observer

twsummer

Date

May 19, 2014 06:52 PM PDT

Photos / Sounds

Square

What

Italian thistle Carduus pycnocephalus

Observer

rkolenda

Date

May 15, 2014 09:28 AM PDT

Photos / Sounds

Square

What

Italian thistle (Carduus pycnocephalus) Carduus pycnocephalus

Observer

paloma

Date

May 13, 2014 01:05 PM PDT

Photos / Sounds

14161830553_36b8eb8a77_s

What

Italian thistle Carduus pycnocephalus

Observer

jaykeller

Date

May 8, 2014 06:36 PM PDT
View all observations

Description from Wikipedia

Carduus pycnocephalus, with common names including Italian thistle, Italian plumeless thistle, and Plymouth thistle, is a species of thistle. It is native to: the Mediterranean region in southern Europe, North Africa, and Western Asia; East Europe and the Caucasus; and the Indian Subcontinent.

No range data available.