x INTRODUCTION 



"a. Leaves simple" (figs. I and II) and "b. Leaves compound" (fig. 

 VI). After the former, the lobed leaf of the oak brings one to 

 "(2). Leaves lobed" (page 15), and under this the choice goes to 



I. Outlines of Simple Leaves. 



1 2 .3 



4 5 



1. Rounded. 2. Cordate (heart-shaped), 

 shaped). 6. Sagittate (arrow-shaped). 



3, 4. Renifoim (kidney-shaped). 5. Peltate (shield- 

 7. Auriculate (eared). 8. Hastate (halberd-shaped). 



"(b) Leaves alternate or fascicled". Under the latter, the oak agrees 

 with "y. Leaves neither fan-shaped nor fascicled", and then with 

 "(y) Leaves more than two-ranked". After the latter, the choice falls 

 upon "n. Leaves less lobed; bark not while", and then upon "(n) 

 Leaf-margin entire". This brings one to the oak genus, Q u e r c u s, 

 which is described on page 257. Here the first step is to read care- 



II. Outlines and Bases of Simple Leaves. 



123 4 5 6 78!' 10 



1. Linear. 2. Lanceolate (lance-shaped). 3. Oblong. 4. Elliptic. ~>. Oval. <i. Ovate 

 (egg-shaped). 7. Oblanceolate. 8. Spatulate (spatula-like). 9. Obovate (reversed ovate). 



10. Cuneate (wedge-shaped). 



fully the description of the genus to make sure that one has retched 

 the right place. The second step is to turn to the key to the species 

 Oil page 258, and to find the species by making choice between "1" and 

 ■'_''■. "a" and "b", etc. The bur oak with the deep rounded blunt lobes 

 of the leaf falls under "2", and then under "a". Here the leaves, but 

 especially the acorn cup, guide one to "(2) Que reus macro- 



