Plant Image
Flower head
Willow Dells Tr - SS

Yavapai County Native & Naturalized Plants

Cirsium ochrocentrum - yellow-spine thistle

Plant Form: Forb

Family: Asteraceae

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Willow Dells Tr
Willow Dells Tr
Underside of leaves
Willow Dells Tr
Plant - summer
Willow Dells Tr
Willow Dells Tr
Forb Plant Description

Origin: Native   Life Cycle: Biennial or perennial
General Desc: The long erect leaves grow close to the stem, allowing the densely hairy white undersides to be seen, making yellow- spine thistle easy to identify from a distance. One of the longest spined thistles in Arizona.
Height: 1 to 3 feet


Habitat Description: Pinon pine/juniper woods, roadsides, rangelands, disturbed areas, woodland clearings.
Plant Communities: Interior Chaparral, Pinyon Juniper Woodland, Montane Conifer Forest, Disturbed Areas
Elevation: 4500 - 8000 feet

Flower Characteristics

Color: Pink or red or yellowish-white     Shape: Daisy or Dandelion-like not in clusters     Tubular: N     Flowering Period: May - Oct
Description: Bloom is made of thin tubular disk flowers sitting on a spherical green base of very spiny bracts; spines point upward.

Leaf and Stem Characteristics

Leaf Color: Grayish-green     Leaf Type: Simple     Leaf Shape: Triangular     Leaf Margin: Lobed     Leaf Attachment: Basal and alternate     Leaves Clasp: Y
Hairs: Leaves and stems     Spines: Y
Leaf Description: Leaves are 4 to 12 inches long, narrowly elliptical, covered with matted white hairs. Each lobe ends in a long yellow spine. The bases of the stem leaves form wings.

Fruit and Seed Characteristics

Fruit Type: Achene

  Arizona Cooperative Extension
Yavapai County
840 Rodeo Dr #C
Prescott, AZ 86305
(928) 445-6590
Version 3.1  
Last Updated: June 15, 2013  
Content Questions/Comments: Email Jeff Schalau  
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