﻿Tree>t of New York State 373 



KEY TO THE GENERA page 



1. Leaves doubly pinnate at least in part; flowers regular, polygamous or 



dioecious 2 



1. Leaves simple or pinnate; flowers papilionaceous or imperfectly pseudo- 

 papilionaceous 3 



2. Leaves bipinnate; calyx- tube elongated, 5-lobed; legume thick and woody 



Gymnocladus 373 

 2. Leaves pinnate and bipinnate; calyx-tube short, 3-5 lobed; legume 



coriaceous i Gleditsia 373 



3. Leaves simple; upper petal enclosed by the others in the bud Cercis 374 



3. Leaves pinnate; upper petal enclosing the others in the bud Robina 374 



KENTUCKY COFFEE-TREE. GYMNOCLADUS Lam. 

 Large trees with stout pithy twigs, large alternate bipinnate 

 leaves, inconspicuous flowers, and large woody legumes. A genus 

 of two species, one native to eastern North America, the other to 

 southern and southwestern China. 



Buds superposed. Leaves alternate, deciduous, unecjually bipinnate, the 

 primary pinnae aside from 1 or 2 basal pairs mth many, usually, alternate 

 leaflets; stipules foliaceous, caducous. Flowers regular, dioecious or polyga- 

 mous, greenish white, borne in terminal racemes; calyx elongated-tubular, 

 lO-ribbed, with 5 narrow, neai'ly equal lobes; petals 5, oblong, equal, pubes- 

 cent, spreading, somewhat longer than the calyx-lobes; stamens 10, distinct, 

 short, inserted with the petals on the calyx-tube; filament.s j)ubescent, of two 

 lengths; pistil consisting of a sessile ovary terminated by a short style and 

 ciblique 2-lobed stigma ; ovules numerous. Fruit a large, oblong, subfalcate, 

 somewhat compressed, woody legunie, tardily dehiscent, containing several 

 seeds separated by a jelly-like pulp; seeds large, ovoid or somewhat obovoid, 

 albuminous, with thick, broA\Ti seed-coat. 



THE HONEY LOCUSTS. Genus GLEDITSIA L. 

 A genus of ten or twelve species of trees, natives of eastern North 

 America, Asia, Japan and tropical Africa. Three species are 

 found in the United States, one widely distributed in the east, a 

 second inhabiting the lower Mississippi basin, and a third restricted 

 to a small area in Texas. But one species, Gleditsia triacanthos 

 (L.), is found in New York State. 



Leaves alternate, deciduous, long-petioled, often fascicled on second year 

 twigs, evenly pinnate, twice pinnate or with some of the secoudan- pinnae 

 replaced by simple leaflets; leaflets subsessile and irregularly crenulate; 

 stipules small, caducous. Flowers regular, polygamous, small, greenish yel- 

 low, borne in slender axillary, sometimes fascicled, spike-like racemes with 

 minute caducous bracts; calyx campanulate, with 3-5 nearly equal lobes, 

 petals 3-5, equaling the calj'x-lobes; stamens 6-10, distinct, inserted with 

 the petals on the edge of the disk; pistil consisting of a nearly sessile ovary 

 terminated by a short style and terminal dilated stigma ; ovules 2-man3'. 

 Fruit a compressed, many-seeded^ elongated, straight, indehiscent legume or 

 an ovate, 2-seeded, tardily dehiscent legume ; seeds suborbieular or oblong, 

 compressed, albuminous, with long funicles. 



