158 WILD FLOWER PRESERVATION 



Amplexicaul, when the base of the blade 

 clasps the stem. (12) 



Perfoliate, when the base of the blade closes 

 round the stem. (13) 



Decurrent, when the margins of the blade 

 continue along the stem. (14) 



Sheathing, when the base of the blade or the 

 expanded leaf-stalk forms a sheath or covering 

 round the stem from the node upwards. (15) 



LEAF POSITION. 



Leaves are said to be 



Radical, when they spring directly from the 

 root. 



Cauline, when they spring from the stems. 



Both may occur upon the same plant. In 

 some cases the radical and cauline leaves are 

 very similar to each other, while in others 

 they are entirely different, as in the Cuckoo 

 Flower. (16) 



LEAF ARRANGEMENT 



Leaves are said to be 

 Opposite, when two spring from the same 

 node on opposite sides of the stem. (17) 



