During lunch today I had a thought: are thistles part of the cactus family? It wasn't the prickliness that led to this association, it was more the discovery of a tiny yellow flower on the tip of each pink petal on the thistle.
But according to my book on wildflowers, thistles are part of the Asteraceae family, decidedly not related to cacti. Which leads me to conclude that these are not thistles at all, and my spark of motivation to better understand biology is dampened once more.
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