Corydalis (kor-rid-al-iss); Fumaria, Fumitory Family (Fmariaceae). A huge genus of hardy, spring-blooming annuals, biennials and perennials. Also known as fume-root because of the strong nitrogenous odor given of by the crushed roots. Native to Europe, Asia, North America, they are graceful plants with feathery, finely divided leaves, blue-green in color.
C. lutea (lew-tee-uh); Yellow Corydalis. An adaptable and all but indestructible species from southern Europe that grows about 9 inches high, with bright yellow flowers ¾ inch long, and attractive rosettes of fern-like much-divided foliage. It blooms from May to August and grows best in shade.