=1. Gleditsia triacánthos= Linnæus. Honey Locust. Plate 106. Medium to large sized trees; bark of old trunks fissured and peeling off in strips; spines on trunk large and often much branched, sometimes 4 dm. long; spines on branches not so large, generally more or less forked; twigs at first green, turning a light brown; leaves pinnate or bipinnate, 1-2 dm. long, rachis permanently pubescent; leaflets 9-14 pairs, fewer on the bipinnate forms, petiolules about 1 mm. long, form variable from ovate to lanceolate, sometimes somewhat falcate, generally 2-3 cm. long, usually more or less pubescent beneath; flowers appear in May or June, inconspicuous, greenish-yellow, rich in honey, their appearance being announced by the hum of the swarm of insects visiting them; fruit a flat, linear twisted pod, 2-4 dm. long, glabrous and lustrous or pubescent on the sides; seeds several, oval, about 6 mm. wide, and 10 mm. long, glabrous and chestnut brown; wood heavy, hard, strong, coarse-grained and takes a good polish. [Illustration: Plate 105. CERCIS CANADENSIS Linnæus. Redbud. (× 1/2.)] [Illustration: Plate 106. GLEDITSIA TRIACANTHOS Linnæus. Honey Locust. (× 1/2.)] =Distribution.=--Pennsylvania, southern Michigan to Iowa, and south to the Gulf States and west to Texas. Found infrequently throughout Indiana along streams, except that it is absent about Lake Michigan and that in the southwestern counties it becomes a frequent tree in the Wabash bottoms. In its native habitat it is rarely found except near a stream, pond, lake, etc. However, in the southeastern counties it has spread all over many of the hillsides which were once cleared and have been abandoned for agricultural purposes and left to natural forest regeneration. It was interesting to learn how this tree was able to propagate itself on the steep bare slopes. It was found that the seeds were scattered by cattle that greedily eat the fruit. It is a medium sized tree, except in the Wabash bottoms of the southwestern part of the State where it grows to be one of the largest trees of the forest, and is more luxuriant than in any other part of its range. =Remarks.=--In making a study of the fruit of this species, it was found that the sides of all the pods of all the specimens at hand except one are glabrous, even those of young fruit. The margins of the pods are pubescent. However, a specimen collected on August 27th in Vermillion County has the entire pod covered with long hairs. In consulting the literature on the subject it is found that some authors describe the fruit as glabrous while others describe it as hairy. It would be interesting to study the significance of this character to learn if each form has a geographic range.