The understories of the mountain slopes and ridgecrests are often covered by dense thickets of rhododendron and mountain laurel. These thickets are often called "hells" due to their general impassability. The most outstanding example of rhododendron-laurel thicket is Jeffrey Hell, located in the Citico Creek Wilderness. Grassy balds—a type of highland meadow consisting of fields of thick grass and sparse tree coverage—are not uncommon in the higher elevations. The summit of the highest mountain in the range—Huckleberry Knob—is a grassy bald. Other grassy balds include Oak Knob (a subpeak of Huckleberry), Hooper Bald, and Bob Bald (a subpeak of Stratton).