National Geographic : 1951 May
© National Geographic Society 575 Kodachromes by Robert F. Sisson + Masses of Mountain Laurel Perfume the Berkshire Hills in June Below: Subarctic conditions are duplicated on the upper life zones of 6,288-foot Mount Washington, New Hampshire, where the wind sometimes exceeds 200 miles an hour and the mercury sinks to 46 below zero. Alpine azalea (Loiseleuria) (upper left) normally ranges from Alaska and Greenland south to Newfoundland, Quebec, and Alberta. In the United States it grows only on upper New England's mountains. The key indicates the tininess of its blossoms. Bog laurel (Kalmia polifolia), in the lower left, ranges north to Labrador; and Labrador tea (Ledum), on the right, to Greenland. Both extend south to Pennsylvania and Michigan. They thrive in poor drainage.