Large outcroppings of this rock form rock overhangs along the trail as it descends to the Townsend Y . Roundtop's forest consists largely of Table Mountain Pine and Pitch Pine trees, which gives way to a mixed mesophytic forest in the coves and hollows at the base of the mountain.
32.
The " Cucurbita digitata ", " C . foetidissima ", " C . galeotti ", and " C . pedatifolia " species groups are xerophytes, arid zone perennials with storage roots; the remainder, including the five domesticated species, are all mesophytic annuals or short-life perennials with no storage roots.
33.
During the Last Glacial Maximum about 18, 000 years ago, the influence of Arctic air masses and boreal vegetation extended to about 33?N . latitude, the approximate latitude of mesophytic forest communities, similar to modern lowland and bottomland forests, occurred along major river drainages, especially the Mississippi embayment, the Alabama-Coosa-Tallapoosa Basin, the Apalachicola-Chattahoochee-Flint Basin, and the Savannah River Basin.
