(Zephyranthes candida)
The soft round foliage of the rain lily makes a wonderful groundcover under light shade. A bulb in the onion family, it will sit quietly in the garden until a mid- or late-summer storm energizes it. Then it will be covered in little short-stemmed white lilies, sometimes for weeks afterwards. There’s a good stand at the Arboretum (pictured here); it can also be planted out in an unmown lawn area just like crocus. Unlike some things (begonias?), more is better.