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 Factory one year before starting work on the Fagus factory) that architects should take account of the way the speed of modern transportation affects the way architecture is perceived. Gropius had also commented the subject in his writings. According to the historian of architecture Annemarie Jaeggi these thoughts were important in the design of Fagus: "The animated fluctuation in height, the change between horizontal structure and vertical rhythms, heavy closed volumes and light dissolved fabrics, are indicators of an approach that deliberately utilized contrasts while arriving at a harmony of opposites in a manner best expressed as a pictorial or visual