Spring draba (Draba verna, syn. Erophila verna (L.) Bess.) may also go by the names shadflower, nailwort, vernal whitlow grass, early witlow grass or whitlow-grass. It is a tiny, tiny plant of sagebrush country, in the inland western U.S., most of Europe, including Britain, North Africa and temperate Asia. It was once thought to have been introduced to America from Europe, but is now considered native to both continents. It grows in very early spring. The...