I can now tell my kids that what we were oohing and aah-ing over, that yellow buttercupish flower from our walk, was lesser celandine, a European invasive that out-competes Maryland's native spring wildflowers like blood root, trillium and the candy-striper pink-and-white beauty aptly called spring beauty. Furthermore, when they pick up a rock that catches their eye because the mica in it glints in the sun, I can say, "That's schist." And it's instructive. And they get to say schist. Schist is common to the metamorphic geology of the Piedmont — our physiographic province.