50 



BOTANY FOR BEGINNERS. 



[Ch.IX. 



194. Ovate, obovate, oval ; these are terms derived from the 

 Latin ovum, an egg ; suppose the figure at 28, a, to represent 

 an egg, you observe that one end is broader than the other , 

 now if to this broad end you add a petiole prolonging it into a 

 rnid-rib with some lateral divisions, you have, as at b, the re 

 presentation of an ovate leaf. If the petiole, were placed at the 

 narrowest end, it would be an obvate leaf. An oval leaf (c) 

 is when both the ends are of equal breadth. When the length 

 is much greater than the breadth, the leaf is said to be elipti- 

 cal, as at d. 



Fig. 29. 



195. Lanceolate, this kind of leaf may be seen in the peach 

 tree; it is represented in Fig. 29, a; this has a serrulated or 

 slightly notched margin; at 6, may be seen the cleft stipules. 

 ^r appendages of the leaf. 



196. Linear, as the grasses and Indian corn, Fig. 29, c, re- 

 presents a leaf of this kind ; it is sheathing, or encloses the st m 

 by its base, as may be seen at d. 



197. Deltoid, from the Greek letter delta A; this kind of lea! 

 is represented at e. Fig. 29; the Lornbardy poplar atfords HB 

 example of the same. 



194. Describe the terras ovate, obovate, and oval. 

 195 Describe a lanceolate leaf. 



195. What is a linear leaf 7 

 197. What is a deltoid leaf? 



