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Virginia thistle
38%
Cirsium virginianum
sandhill thistle
35%
Cirsium repandum
Arizona thistle
33%
Cirsium arizonicum
Franciscan thistle
30%
Cirsium andrewsii
prairie thistle
30%
Cirsium canescens
Douglas' thistle
30%
Cirsium douglasii
mountaintop thistle
30%
Cirsium eatonii
Flodman's Thistle
30%
Cirsium flodmanii
fountain thistle
30%
Cirsium fontinale
Mojave thistle
30%
Cirsium mohavense
Nuttall's thistle
30%
Cirsium nuttallii
meadow thistle
30%
Cirsium scariosum
wavy-leaf thistle
30%
Cirsium undulatum
Greene's thistle
30%
Cirsium inamoenum
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