Yeah, that's the image that convinced me crabapples could be that size. I've always thought of them as larger, too, but I didn't really learn to distinguish various Maloideae species until relatively recently. It's a pain because there are so many cultivars and natural hybrids; my guide to trees of the Eastern US basically throws up its hands when it comes to the hawthorn genus (Crataegus), saying it's difficult even for trained botanists to tell individual species apart.