The Forms of Leaves. 



53 



oblong, and broadly elliptical. In a similar way we name 

 intermediate forms of those shown in 

 Fig. 42. The meaning of lance-ovate, 

 narrowly lanceolate, broadly ovite, etc., 

 is obvious.* If you have a leaf lance- 

 olate in outline with the stem at the 

 narrow end, it is ob lanceolate, as shown 

 in Fig. 44. You may possibly have 

 the forms obovate, which is the reverse 

 of ovate. Unusual but possible forms 

 are obreniform, obcordate, and obfalcate. 



Save the leaves you have just studied and bring for the 

 next exercise as many other forms as possible. Get also as 

 many types of margin as you can (see Fig. 45). 



a. Linear, b. Broadly linear, c . Elliptical, d. Broadly elliptical, e. Peltate. 

 /. Hastate, g. Sagittate. 



* It will be a good exercise to cut these forms out of paper. First, cut into 

 the orbicular form, and then, by trimming the sides, make in succession the 

 forms: broadly elliptical, elliptical, elliptic-oblong, oblong, narrowly oblong, 

 broadly linear, linear, narrowly linear. In a similar way, beginning with ovate, 

 cut out the base to cordate, cut off the upper part to reniform, etc. 



