East of the Great Lakes and over a large part of the South the boxwood (Buxus sem-pervirens), mountain laurel (Kalmia latifolia), American holly (Ilex opaca), great laurel (Rhododendron maxima), and the beautiful mountain laurel (Rhododendron cataw-biense) can be used to great advantage in shady positions and as undergrowth on the borders of tree groups. But

in the dry air of the prairie States, planted in limestone drift soils, they are all failures except in parts of Wisconsin, where the granitic soil permits the thrifty growth of the mosses and the cranberry and huckleberry (277 and 280). The holly-leaved Mahonia {Mahonia aquifolium) as found native in the Black Hills and in the Lake Superior region does well in half shaded and sheltered positions in the prairie States and well across the continent. Its handsome glossy foliage, neat habit, and bluish berries render it popular where the other broad-leaved evergreens fail. The Savin, prostrate juniper, Pinus pumilio, and Pinus mugho also are used at the West for covering rock-work, giving variety to tree groups, and sometimes as single specimens.