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Diffuse Knapweed

Russian Knapweed

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Purple Loosestrife

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Yellow Starthistle

Canada Thistle

Musk Thistle

Scotch Thistle

Dalmatian Toadflax

Yellow Toadflax

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Yellow Starthistle
Centaurea solstitialis
 
Rosette

Rosette leaves are deeply lobed and could be confused with dandelion.
Adult

Yellow starthistle is a two to three foot tall winter annual with blue-green coloration.
Flower

Flowers are yellow. Cream-colored thorns, one-quarter to three-quarter inches long, protrude from the flowering heads. Bloom is in early summer.
Weed Infestation

Yellow starthistle was introduced from Europe. It grows well on dry sites in rangeland, roadsides, and waste areas. It can cause "Chewing disease" in horses that consume it.
Winged Stem

Stems are sparsely leaved and heavily ridged.
Tap Root
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