Flowers diœcious or polygamous, regular. Calyx elongated-tubular below, 5-cleft. Petals 5, oblong, equal, inserted on the summit of the calyx-tube. Stamens 10, distinct, short, inserted with the petals. Pod oblong, flattened, hard, pulpy inside, several seeded. Seeds flattish.--A large tall tree, with rough bark, stout branchlets, not thorny, and large unequally twice-pinnate leaves; the leaflets standing vertically.--Flowers whitish, in terminal racemes. (Name from γυμνός, _naked_, and κλάδος, _a branch_, alluding to the stout branches destitute of spray.) 1. G. Canadénsis, Lam. Leaves 2--3° long, with several large partial leafstalks bearing 7--13 ovate stalked leaflets, the lowest pair with single leaflets; stipules wanting; pod 6--10´ long, 2´ broad; the seeds over ½´ across.--Rich woods, western N. Y. and Penn. to Minn., E. Neb., and Ark. 44. GLEDÍTSCHIA, L. HONEY-LOCUST. Flowers polygamous. Calyx short, 3--5-cleft, the lobes spreading. Petals as many as the sepals and equalling them, the 2 lower sometimes united. Stamens 3--10, distinct, inserted with the petals on the base of the calyx. Pod flat, 1--many-seeded. Seeds flat.--Thorny trees, with abruptly once or twice pinnate leaves, and inconspicuous greenish flowers in small spikes. Thorns above the axils. (Named in honor of _J. G. Gleditsch_, a botanist contemporary with Linnæus.) 1. G. triacánthos, L. (THREE-THORNED ACACIA, or HONEY-LOCUST.) Thorns stout, often triple or compound; _leaflets lanceolate-oblong_, somewhat serrate; _pods linear, elongated_ (1--1½° long), often twisted, filled with sweet pulp between the seeds.--Rich woods, western N. Y. and Penn. to Ga., west to Mich., E. Neb., Kan., and La. A large tree, common in cultivation, with very hard and heavy wood. 2. G. aquática, Marsh. (WATER-LOCUST.) Thorns slender, mostly simple; _leaflets ovate or oblong; pods oval, 1-seeded_, pulpless. (G. monosperma, _Walt._)--Deep swamps, Mo. to S. Ind., S. Car., and southward. A smaller tree, 30--40° high. 45. DESMÁNTHUS, Willd. Flowers perfect or polygamous, regular. Calyx campanulate, 5-toothed. Petals 5, distinct. Stamens 5 or 10. Pod flat, membranaceous or somewhat coriaceous, several-seeded, 2-valved, smooth.--Herbs, with twice-pinnate leaves of numerous small leaflets, and with one or more glands on the petiole, setaceous stipules, and axillary peduncles bearing a head of small greenish-white flowers. (Name composed of δέσμα, _a bond_, and ἄνθος, _flower_.) 1. D. brachýlobus, Benth. Nearly glabrous perennial, erect (1--4° high); pinnæ 6--15 pairs; leaflets 20--30 pairs; peduncles 1--3´ long; stamens 5; pods _numerous in dense globose heads, oblong or lanceolate_, curved, scarcely 1´ long, 2--6-seeded.--Prairies and alluvial banks, Ind. and Ky. to Minn., Mo., and Tex.; also in Fla.