LEGUMINOSAE. ' 103 



20. Leaves nearly as broad as long, glabrous. P. Mahaleb. 

 Leaves equally broad : villous. P. tomentosa. 

 Leaves distinctly elongated. P. pennsylvanica. 



21. Flowers and fruit in umbels. (Cherries). 22. 

 Flowers and fruit in racemes. (Bird-cherries). 24. 



22. Tree percurrent : leaves rather drooping. 23 



Tree deliquescent : leaves spreading. P. Cerasus. 



23. Young leaves hairy. P. avium. 

 Young leaves glabrate. P. serrulata. 



24. Leaves with incurved teeth: buds brown. P. serotina. 

 Leaves with spreading teeth, relatively short. 25. 



25. Buds brown: flowers rather large (15 mm.) P. Padus. 

 Buds straw-colored: flowers small (10 mm.). P. virginiana. 



Family LEGUMINOSAE. Pea Family. 



A very large and heterogeneous widespread family compris- 

 ing some of the most valuable plants of farm and garden, the 

 sweet pea of florists, and many of the most useful plant mate- 

 rials of landscape gardeners, and producing some of the most 

 costly tropical cabinet woods. Through their power of fixing 

 atmospheric nitrogen, even weeds of this family enrich poor soil. 



GYMNOCLADUS. Kentucky Coffee Tree. 



Deciduous large rough-barked trees with hard pinkish wood 

 with rather large crowded ducts in spring, those of autumn re- 

 duced in size and number and in a wavy transverse pattern, and 

 fine medullary rays ; stout round twigs with large chocolate-col- 

 ored continuous pith ; alternate somewhat raised large bluntly 

 heart-shaped leaf-scars with about 5 bundle-traces ; small if any 

 stipule scars ; round indistinctly scaly superposed buds sunken in 

 ciliate craters, the end-bud absent; large abruptly pinnate or bi- 

 pinnate leaves with entire leaflets ; often imperfect pale polypeta- 

 lous regular flowers with .tubular calyx, in terminal panicles ; and 

 large thick-walled legumes with large brown seeds. 

 Base leaves once pinnate : leaflets bristle-pointed. G. dioica. 



GLEDITSIA. Honey Locust. 



Often large deciduous deliquescent trees mostly with 

 branched spines above the axils ; yellowish or finally reddish hard 



