The upland plateau section of the M&M Trail supports transitional forests of species common to both the oak-hickory and northern hardwood forest types. Ravines support significant stands of eastern hemlock, and stands of white pine are common throughout. Tree and shrub species also include sugar maple; red maple; gray, black, paper, and yellow birch; white ash; black oak and red oak; striped maple; mountain laurel; and, on exposed dry ledges, pitch pine. Northern boreal species, particularly red spruce, become apparent on peaks in the northern part of the M&M Trail. The high, exposed ledges of Mount Monadnock support several alpine and sub-alpine species of plants, including mountain ash, cotton grass, sheep laurel, mountain sandwort, and the mountain cranberry. Krummholz, trees stunted by harsh weather, are found on Mount Monadnock, as are several alpine bogs. The northernmost stand of native rhododendron (growing naturally, not planted) in eastern North America is located just off the M&M Trail on Little Monadnock Mountain in Rhododendron State Park, New Hampshire.