ELEMENTS OK STRUCTURAL BOTANY. 



to 



the forms s'piitliiihitc (Fif,'. Ill), ohlKiiccuhiic (tbat i>i, tlie 

 reverse of laucool.ite) (Fig. 115), and <'/"»(•(///■ (Fig. llt>). 

 108. In leaves of the second kind we frequently find 

 the base indented, and then the leaf 

 is cordate, or heart-shaped (Fig. 117\ 

 The reverse of this, that is, when the 

 indentation is at t4ie apex, is ohcor- 

 date (Fig. 118). The hastate, or spear- 

 shaped (Fig. 119), sfiiiittate, or arrow- 

 shaped (Fig. 120), and reniform, CnT 

 kidney-shaped (Fig. 121), forms are 

 Ti". 119. modificxtions of the second class, 



Fig. 120. 



Fig. 1-21. 



Fig. 122. 



and will be readily understood from the annexed figures. 

 If the petiole is attached to any part 

 of the under surface of the leaf, instead 

 of to the edge, the leaf is peltate (shield- 

 shaped) (Fig. 123). 



lOU. Leaves which are lobcd are 

 usually described by stating whether 

 Fig. 123. they are palmately or pinnately veined, 



and, if the former, the number of lobes is generally 



