How can I find out exactly what kind of thistle I have?

One way to refine your search might be to use the “Identify Your Weed” binomial key, moving quickly through the choices to the grouping that includes thistles. Another way would be to “Search the Weed ID Database” by putting in “thistle” as your key word. This will bring up a long list of weeds whose names include the word “thistle” in them. From here you can select those which seem to be more likely to be the one you have.  

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