108 American Midland Naturalist Monograph No. 2 



1. Leaves obovate, finely serrate, tapering at the base; stipules oval; nut ovate; 

 wet ground, s. III., as far n. as Wabash Co. Apr.-May. Smooth Alder .... 

 A. rugosa (DuRoi) Spreng. 



3. CoRYLUS L. — Hazel 



C. americana Walt. Thickets, common; probably the only species in 111. 

 Mar.-Apr. 



4. Carpinus L. 



C. caroliniana Walt. Blue Beech. Muscle Tree. Woods, common. Apr.- 

 May. 



5. OsTRYA Scop. 



O. virginiana (Mill.) K. Koch. Ironwood. Hop-hornbeam. Woods, com- 

 mon. Apr.-May. 



42. Fagaceae a. Br. — Beech Family 



l.Stamlnale flowers in small pendent globose heads on slender peduncles; nuts sharply 



trigonal; winter buds lanceoloid, acuminate 1. Fagus 



I.Slammate flowers in slender catkms. 

 2. Staminate catkins erect or ascending, 15-30 cm. long; involucre prickly, 2-7-flowered 



2. Castanea 



2. Staminate catkins pendent; fruit an acorn in a scaly involucre-cup; winter buds 

 ovoid, obtuse or acute 3. C^uercus 



1. Fagus L. — Beech 



F. grandijolia Ehrh. American Beech. Woods, especially near streams, 

 local; chiefly in the valleys of the Mississippi, Ohio, and Wabash rivers; absent 

 from centr. and w. 111. 



2. Castanea Hill — Chestnut 

 C. dentata (Marsh.) Borkh. Rocky woods, s. 111., very rare. Pulaski and 

 Union counties. June. 



3. QuERCus L. — Oak 



1 . Leaves entire, elliptical or oblanceolate, bristle-tipped. 



2. Leaves permanently stellate-tomentulose beneath; woods, common. Shin- 

 gle Oak Q. imbricaria Michx. 



2. Leaves quite glabrous on both surfaces, or sometimes sparsely pubescent 



on the lower surface along the midvein; moist woods, rare. Massac Co., 



Teljord in 1924; Mermet, McDougall 145. Willow Oak 



Q. phellos L. 



1 . Leaves not entire. 



3. Leaf-lobes with bristle-tips; acorns maturing the second season. (Red or 



Black Oaks.) 



4. Leaves 3-5-lobed above the middle, obovate in outline. 



5. Leaves glabrous or nearly so beneath; buds ovoid, small; acorn-cups 

 saucer-shaped, 1.5 cm. in diameter; woods, Crystal Lake Park, 

 Urbana, G. N. Jones 12514; supposedly a hybrid between Q. 

 borealis and Q. hnbricaria Q^. riincmata Engelm. 



