I always mix up sweater and sweatshirt for some reason. I also can't identify most species of tree or flower, even the most common ones. I've heard of plant names like oak, maple, birch, pansey, daisy, patunia, and ash; but chances are pretty good I wouldn't be able to put the name to the plant. I think I can get oak and maple at least, but I might misidentify some other species of tree with them too. I also know pine, of course.
This is one reason why my systemizing quotient is lower than it could be; that test uses specific examples, and plants are one of them.