Appalachian-Blue Ridge forests hickories ("Carya" spp.), red maple ("Acer rubrum"), sugar maple ("Acer saccharum"), white ash ("Fraxinus americana"), tulip tree ("Liriodendron tulipifera"), American beech ("Fagus grandifolia"), black cherry ("Prunus serotina"), black birch ("Betula lenta"), black tupelo ("Nyssa sylvatica"), and American elm ("Ulmus americana"). Flowering dogwood ("Cornus florida") is a common understory tree. Central Appalachian pine-oak rocky woodlands occur on lower-elevation hilltops, outcrops, and rocky slopes and have a patchy or open aspect. Pitch pine ("Pinus rigida") and Virginia pine ("Pinus virginiana") are common within their respective ranges. These pines are often mixed with dry-site oaks such as chestnut oak ("Quercus prinus"), bear oak
Fagus sylvatica in the buds. In autumn, the tree builds the reserves that will sustain it into spring. Given good conditions, a bud can produce a shoot with up to ten or more leaves. The terminal bud emits a hormonal substance in the spring that halts the development of additional buds. This tendency, though very strong at the beginning of their existence, becomes weaker in older trees. It is only after the budding that root growth of the year begins. The first roots to appear are very thin (with a diameter of less than 0.5 mm). Later, after a wave of above