Okay, I can get a bit pedantic about plants, like upsetting the rest of the audience in the movie theatre by yelling: "But they hadn't imported tomatoes from South America yet!" when the crowd threw rotten ones at Mel Gibson in Braveheart. My husband threatened to stop watching historical movies with me when I loudly objected to the hybrid tea roses in a movie production of Pride and Prejudice (those hybrid teas hadn't been bred in the days of bonnets and Mr Darcy).
On the other hand, I accept that pelargoniums can be called geraniums even if the aren't, because that's the name most people use. But sometimes it's important to get plant names correct.
