Classification
Within iNaturalist.org

All Names

  • Scientific Names
    • Cirsium
  • English
    • Thistles
  • Spanish
    • Cardos

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Creative Commons Flickr Photos Tagged "Cirsium."
Invite photos to iNat » View all photos tagged "Cirsium" on Flickr »

Recent observations

Photos / Sounds

What

Bull Thistle Cirsium vulgare

Observer

faerthen

Date

August 20, 2014 02:06 PM PDT

Photos / Sounds

Square

What

Tall Thistle Cirsium altissimum

Observer

nvarvel

Date

August 16, 2014

Photos / Sounds

Square

What

Thistles Genus Cirsium

Date

August 8, 2014 01:45 PM EDT

Description

Bull thistle or field thistle not sure.

Photos / Sounds

Square

What

Bull Thistle Cirsium vulgare

Date

August 15, 2014 11:43 AM EDT

Photos / Sounds

What

Field Thistle Cirsium discolor

Observer

dlcarterksu

Date

August 15, 2014

Photos / Sounds

What

Texas thistle Cirsium texanum

Observer

aztekium

Date

July 6, 2014 10:53 AM CDT

Photos / Sounds

14726978717_85e065f1ac_s

What

Bull Thistle Cirsium vulgare

Observer

jaykeller

Date

August 9, 2014 03:52 PM PDT

Photos / Sounds

What

Tall Thistle Cirsium altissimum

Date

August 14, 2014 07:14 AM EDT

Photos / Sounds

What

Field Thistle Cirsium discolor

Observer

elfaulkner

Date

August 14, 2014 03:07 PM CDT

Photos / Sounds

What

Thistles Genus Cirsium

Observer

damontighe

Date

August 10, 2014 10:37 AM MDT

Photos / Sounds

Square

Observer

danielboyes

Date

the past

Photos / Sounds

Square

What

Canada thistle Cirsium arvense

Observer

knri_socialmedia

Date

August 12, 2014

Description

Canada Thistle has become the most wide spread invasive weed in North Dakota.

Long lived perennial with an extensive root system that can grow laterally 12-15 feet per year.

Leaves are oblong, usually deeply cut and have spiny-toothed edges.

Flowers range from purple to rose and sometimes white. Male and female flowers are produced on different plants.

Canada thistle was listed in 1885 by Dakota Territory as "required of every person to destroy this weed."

View all observations

Description from Wikipedia

Cirsium is a genus of perennial and biennial flowering plants in the Asteraceae, one of several genera known commonly as thistles. They are more accurately known as Plume thistles. These differ from other thistle genera (Carduus, Silybum and Onopordum) in having feathered hairs to their achenes. The other genera have a pappus of simple unbranched hair.

No range data available.