Geography of North Carolina grape varieties of America are native to North Carolina; the Catawba, Isabella, Lincoln, and Scuppernong. Seventeen major river basins have covered at least part of the state of North Carolina. These rivers can be broadly divided into three groups. In the extreme western part of the state, there are rivers that flow in a northwesterly direction, draining into the Gulf of Mexico through the Mississippi River. In the central part of the state, rivers flow generally southward into South Carolina before reaching the Atlantic Ocean. In the eastern part of the state, most of the rivers flow generally in an
Scorza variety Scorza variety In mathematics, a "k"-Scorza variety is a smooth projective variety, of maximal dimension among those whose "k"–1 secant varieties are not the whole of projective space. Scorza varieties were introduced and classified by , who named them after Gaetano Scorza. The special case of 2-Scorza varieties are sometimes called Severi varieties, after Francesco Severi. Zak showed that "k"-Scorza varieties are the projective varieties of the rank 1 matrices of rank "k" simple Jordan algebras. The Severi varieties are the non-singular varieties of dimension "n" (even) in P that can be isomorphically projected to a hyperplane and satisfy "N"=3"n"/2+2.