The Water Oak (Quercus nigra, Linn.) is a good-sized tree, with a leaf of somewhat similar outline, but thinner texture than those of the black jack. It is a favourite shade tree in the Southern States. It grows naturally along the borders of streams and swamps, but is easily transplanted, grows rapidly and thrives in cultivation. Its shining leaves, blue-green above, paler below, vary from entire margins to lobing as deep as the average red oak shows. The acorn is a squat little nut in a shallow cup, set with fine scales.