There were a number of spring flowers doing their thing at Yellowstone a couple weeks ago. I saw a patch of bright yellow and took this photo:

Yes, dandelions. They were all over. I talked to a ranger nearby who said that the park has a big problem with invasive species. He wasn’t a botanical expert, he said, but he thought there was a true wild dandelion, as well as the garden version. Unfortunately, this to me looks like the garden version. They were all over the park, as well as all over Idaho on the way there.