The north slope of Round Top is home to a number of tree species, most prominently whitebark pine, western white pine, and lodgepole pine. The summit of the mountain rises above the tree line. Western white pine and lodgepole pine grow up to about . The whitebark pine survives in the form of short, stubby krummholz to as high as . A specimen of the Lake Tahoe lupine (Lupinus meionanthus) has been identified at the summit of Round Top.