[Thistles: The Genus Cirsium West of the Cascade Mountains of Oregon and Washington]

Snowwool Thistle, Snowy Thistle

Cirsium occidentale var. candidissimum

Synonym: Cirsium pastoris

Close-up of the flower head of Snowy Thistle, Snowwool Thistle: Cirsium occidentale var. candidissimum (Synonym: Cirsium pastoris)

Close-up of the flower head of snowy thistle as seen along Forest Service Road 4201, Siskiyou National Forest........July 15, 2012.

Snowy Thistle, Snowwool Thistle: Cirsium occidentale var. candidissimum (Synonym: Cirsium pastoris) - Snowy Thistle, Snowwool Thistle: Cirsium occidentale var. candidissimum (Synonym: Cirsium pastoris)

Leaf of Snowy Thistle, Snowwool Thistle: Cirsium occidentale var. candidissimum (Synonym: Cirsium pastoris)

Snowy Thistle, Snowwool Thistle: Cirsium occidentale var. candidissimum (Synonym: Cirsium pastoris) - Inflorescence of Snowy Thistle, Snowwool Thistle: Cirsium occidentale var. candidissimum (Synonym: Cirsium pastoris)

Snowy thistle as seen along Forest Service Road 4201, Siskiyou National Forest........July 15, 2012.
Paul Slichter