The word "Iris" conjures up visions of brilliant, ruffled blooms, for they are among the best known and best loved of garden plants. This huge genus contains upwards of 200 species, which range from flashy divas to smaller, more subtle forms. They all elevate the June garden with their eye-catching flowers, and provide clear, carefree vertical accents with their foliage for the balance of the season. Here we offer some of our favorites.