=Gleditsia aquatica × triacanthos.= Dr. Schneck[58] found two honey locust trees which he described as hybrids of the two species. The one was located on the bank of Dan's pond in Knox County, and the other in Gibson County. The original description is as follows: "In both instances the pods are the distinguishing feature. These are very much alike in both trees, being about 5 inches long, 1-1/2 inches wide, smooth, shining, of a light brown color and entirely destitute of pulp. Otherwise the tree cannot be distinguished from the trees among which they stand. They are both about 50 feet high, with short stems and spreading branches, and stand about 5 miles apart." The writer has five fruiting specimens from these two trees, taken by Dr. Schneck. Two of the sheets have the round and branched spines of _G. triacanthos_. =3. GYMNÓCLADUS.= The Coffee Tree. =Gymnocladus dioíca= (Linnæus) Koch. Coffeenut Tree. Plate 108. Medium sized trees; bark of trunks fissured, the ridges often curling up along the sides, very hard; twigs at first hairy, becoming glabrous and mottled gray-brown by the end of the season, robust, usually about 1 cm. in diameter; leaves alternate, twice pinnate, 3-9 dm. long, leaflets usually 6-10 pairs, ovate, generally from 3-4 cm. long, generally oblique and rounded, wedge-shape or truncate at the base, acute or very sharp-pointed at the apex, petiolules about 1 mm. long, pubescent on both sides at first, becoming glabrous or nearly so at maturity; flowers of two kinds, the male and female on separate trees, appearing in May or June; fruit a pod generally about 1-2 dm. long, thick, curved; seeds generally 4-7, large, flattened about 2 cm. in diameter; wood heavy, not hard, coarse-grained and takes a high polish. =Distribution.=--New York, southwestern Ontario to southern Minnesota south to Tennessee and Arkansas. This species has been reported or is known to exist in 33 counties in various parts of the State. It no doubt was native to every county of the State, except it be those bordering Lake Michigan from which we have no reports. It is a rare tree in all parts. Only exceptionally is it found even frequently. A few trees may be found in one place, and it will not be found again for many miles. No doubt there are many areas with a radius of 5 to 10 miles where this tree never occurred. It is usually found in alluvial soil along streams, or nearby terraces. =Remarks.=--This species generally is not very tall, and is usually found in open places in the forest or cut-over lands. However, one specimen was seen in Posey County that was as tall as a specimen of pecan of equal size that grew nearby. This species was so rare in this vicinity that I was asked to drive three miles to identify this tree which no one could name. Coffeenut, which is sometimes called Kentucky coffeenut, has always been so rare as to be of little economic importance. It has no qualities to recommend it for ornamental planting.