Leaves not yellow green beneath; base of the petiole of the terminal leaves not enlarged, petioles smooth, or if pubescent at the base the pubescence will be more or less evident the entire length of the petiole. Petioles smooth; leaves 3-5 lobed, blade as long or longer than wide, not densely pubescent beneath at maturity. 5 A. saccharum. Petioles smooth; leaves 3-lobed, blades wider than long. A. saccharum var. Rugelii. Petioles pubescent, rarely smooth; leaves 5-lobed, rarely 3-lobed, the under surface densely pubescent at maturity. A. saccharum var. Schneckii. =1. Acer Negúndo= Linnæus. Box Elder. Plate 111. A medium-sized tree with a short trunk and round head; bark of young trees smooth and gray, becoming thick on old trees, light to dark brown and more or less furrowed or rarely somewhat flaky; twigs smooth and greenish; leaves of average size are 1.5-3 dm. long, generally with 3 leaflets on the flowering branches, sometimes 5 or rarely with 7, on sterile branches or on growing shoots 3-7, the petioles generally 1/3-1/2 the length of the leaf and glabrous or nearly so at maturity; leaflets all on stalks more or less pubescent, the lateral stalks short, the terminal ones much longer, leaflets of varying size and shape, the margins usually varying from lobed to serrate or entire, pinnately veined, smooth above at maturity and remaining more or less pubescent beneath, especially along the veins; flowers appear just before the leaves the last of April or the first of May, the staminate and pistillate on separate trees; fruit matures late in summer, the body of the samara green and more or less pubescent. =Distribution.=--New England to Florida, west to Minnesota and south to eastern Texas. In Indiana, it is found throughout the State in moist or wet places along creeks and rivers, and infrequently on the highlands along roadsides and fences. Its original distribution in the State can only be conjectured. Judging from its tolerance to shade and its habitat, and from the earliest reports of its occurrence in the State, this species was quite rare in the northern part of the State, becoming infrequent to frequent in its habitat in the southern part of the State. Even today it is rather local in its distribution. I have never seen it on the low mucky border of a lake.