Ini; I^'iF.L!) Mantai, 



MoiH'cious : nuts small, conipressed, in woody cone-like 

 aments which arc jiersistent thronsbout the year. 



I. Leaves ohovate. hroadl\- oval or suboricular, dull : cat- 

 kins expanding- long before the leaves. ".I. 



1. Leaves ol)long. shining al)o\e. catkins ex]:)anding in an- 

 tunni. .]. maritiiiia. 



'1. Leaxes linely tomentose or glaucous beneath. A. incaiia. 



1. Leaves green, glabrous or sparingly pubescent beneath. '■\. 



•"). Leaves hnely serrulate, foliage not glutinous. A. rmiosa. 



•"). Leaves dentate-serrate; twigs glutinous. ./. abuts. 



!. Alnus incana (L.) Willd. Hoary Alder. A shrub 

 or small tree with the young shoots pubescent. Wood soft, 

 light brown. In wet soil. Newf. to Sask., X. Y., Penn., Ohio 

 and Xei). Also in Europe and Asia. 



•1. Alnus rugosa (DuRoi) Spreng. Smooth Alder. A 

 slirub or small tree wdth smooth bark, the young shoots some- 

 what pul)escent. Wood soft, light brown. In wet soil or on 

 b.illsides. ^Ae. to Ohio. Minn.. Fla.^ and Tex." 



8. Alnus alnus (L.) Britt. European Alder. A tree 

 of rapid growth, developing readily in ' ordinary dry soil 

 Usually in wet places. Wood soft, brown. Xative of Europe. 

 Xewf.. and X. J. to 111. 



4. Alnus maritima (Alarsh.) ]\Iuhl. Seaside Alder. A 

 small tree, glabrous or nearly so. Wood soft, light brown. 

 In wet soil. Del. and ^Id. ; also in Okla. 



J iKjhindaccac. Walnut l-'amily. 

 fil. Hicoria Raf. Hickory. 



Large trees with alternate serrate odd-pinnate leaves, ter- 

 minal buds, o-angled solid pith, and numerous bundle scars 

 scattered or in -'j areas. 



Monecious; axillary buds superposed; staminate llowcrs 

 in slender aments ; fruit a nut in a husk. 



1. Terminal l)ud-scales valvate, 4-n ; leaflets 7-15, lanceolate 

 or oblong-lanceolate, more or less falcate. 2. 



1. Terminal bud-scales imbricate, more than (i; leaflets •■^-!', 

 not falcate, the uppermost larger and generally 

 obovate. 1. 



