84 



THE LEAF 



another step to winding about them in the fashion of a 

 tendril. The complete adoption of the clasping habit, 



taken on in this case 

 by the petiole, is seen 

 in the Solanum jas- 

 minoides of the gar- 

 dens (Fig. 70) and 

 the common Clem- 

 atis. 



147. Or the ten- 

 dril habit may orig- 

 inate in the blade 

 itself. Thus the pro- 

 longed medium portion of the blade in Crloriosa (Fig. 71) 

 curves round the supporting object. This is a simple 

 leaf. Several compound 

 leaves, as those of the Pea 

 and Sweet Pea, have the 

 extremity of the main 

 stalk, or rachis, developed 



71. Tendril leaves of Gloriosa superba. 



If 



72. Tendril leaves of Lathy- 

 rus Aphaca, the stipules 

 performing the duty of 

 foliage. 



into a tendril having all 

 the qualities of the stem- 

 tendrils before described. 

 The leaflets also, in these 



cases, may be transformed 73 - Tendril leaf of Cobsea macrostemma ; 



st, main stem of the plant ; If, the 

 for the Same purpose. In extent of a single leaf. 



