Flatwoods.
Black Prairie.
Fig. 79.—Extreme Forms of Post Oak
(Quercus minor Marsh., obtusiloba Mich.).
On the brown-loam lands the black-jack, like the post oak, has a rather slender, often somewhat crooked, but excurrent trunk 35 to 50 feet high, with more or less crooked limbs of moderate length, well provided with leafy branches, but forming altogether a rather open crown. A depauperated form of this type occurs on the sandy ridges of the yellow-loam region and is 12 to 15 feet high, with slender, crooked branches, clothed with scanty foliage; as shown in [Figure No. 80], alongside of the other typical forms.
Loam Upland.
Flatwoods.
