In May and June PieChef.com is flooded with people looking for rhubarb pie recipes. And why not? Rhubarb is a great flavor that makes wonderful pies.
According to Wikipedia, in the US until the 1940s rhubarb (rheum) was considered a vegetable. It was reclassified as a fruit when US customs officials, baffled by the foreign food, decided it should be classified according to the way it was eaten.
And when I looked it up in my dictionary, I found that “this species is sometimes called “pie plant.” Makes sense to me!