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| Kingdom Plantae |
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Cirsium butleri (Rydb.) Petr. – not accepted
|
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Cirsium canovirens (Rydb.) Petr. – not accepted – graygreen thistle
|
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Cirsium coloradense ssp. acaulescens (Rydb.) Petr. – not accepted
|
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Cirsium floccosum (Rydb.) Petr. – not accepted
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Cirsium kelseyi (Rydb.) Petr. – not accepted
|
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Cirsium lacerum (Rydb.) Petr. – not accepted
|
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Cirsium olivescens (Rydb.) Petr. – not accepted – summer thistle
|
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Cirsium osterhoutii (Rydb.) Petr. – not accepted – Osterhout's thistle
|
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Cirsium perplexans (Rydb.) Petr. – accepted – Rocky Mountain thistle, spring thistle
|
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Cirsium polyphyllum (Rydb.) Petr. – not accepted
|
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Cirsium tracyi (Rydb.) Petr. – accepted – Tracy's thistle
|
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Cirsium tweedyi (Rydb.) Petr. – not accepted |
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