Lobed and Compound Leaves. 



55 



the midrib into a sharp point makes the leaf mucronate. 

 The bases of leaves may be acute, acuminate, obtuse, or 

 truncate. Arrange your classified leaves in order on sheets 

 of paper, writing under each a brief description. 



Are any of the leaves one-sided? Did any of them grow 

 in such a way that one edge was nearer than the other to 

 the stem on which they grew ? Are the petioles of any of 

 the leaves flat? Which way are they flattened, at right 

 angles with the blade, or so as to be parallel with it ? Did 

 any of the leaves hang nearly vertically ? 



Get for the next exercise, if possible, leaves of elm, 

 poplar, eucalyptus, pepper-tree, buckeye, geranium, ivy, 



a b c d e f g 



Fig. 45. a. Serrate, b. Dentate, c. Crenate. d. Repand, or undulate, e. Sinuate, f. Incised. 



g. Erose. 



g. urose. 



clover, and any forms not already procured. Note particu- 

 larly their position on the stem. 



EXERCISE 32. 



Lobed and Compound Leaves. Classify all your 

 leaves putting them into three sets: (i) those which 

 are entire; (2) lobed leaves (see #, b, c, and e in Fig. 46); 



