When I was a kid I thought a teasel* was probably a kind of thistle**, because they were both prickly, which is a good defense against wandering herbivores. It turns out that botanically they’re in the same class (Magnoliopsida—more or less), but that’s the closest they’re related.
I snapped this at the Bot Garden the other month, so this is probably a non-native and it may not even be a thistle, although it resembles one (sorry, I neglected to take notes while I was photographing). Love the bumbler….
* Apparently teasels are favored by some weavers for brushing new fabric to raise the nap, and they were cultivated to assure a proper supply. Who knew?
** In Celtic symbolism, thistles and burrs apparently refer to nobility of character and of birth, a lovely thought for what I think of as annoying weeds that typically grow in poor soils.