It’s easy to miss this teeny-tiny little forget-me-not (Myosotis discolor). Its flowers look just like those of its larger cousin–but they are just a millimeter across (sometimes as large as 3mm). They unfurl in a tiny, fuzzy curl and you have to look close to even see the color at all. They aren’t native–their homeland is Europe–but they aren’t particularly invasive either, and for some reason I find them delightful.
Once you train your eye to spot them they are surprisingly common, thriving in moist coastal grasslands (though from the map, their range seems to include mountains as well). Look for this little plant in all coastal states on both the east and west coast.