TO BOTANY. 139 



Opposite, when the cauline leaves come out in 

 pairs facing each other, and each pair is crossed by 

 the next, so that they point four different ways. 



Alternate ; when they come out singly, and follow 

 in a gradual'order. 



Sparsed, scattered ; when they come out in plenty 

 about the plant without order. 



Confert, crowded; when they come out in quan- 

 tities, so as almost to cover the branches, and leave 

 hardly any space between them. 



Imbricate; when they are confert and erect, so as 

 to lie over one another, each covering a part of the 

 following one. 



Fasciculate, bundled ; when many come out from 

 the same point; as in Larix. 



Distich, in two rows; when the leaves all respect 

 two sides of the branches only; as in Abies and 

 Diervilla. 



In respect to their INSERTION (which is usually at 

 the base) leaves are called, 



Peltate, shield-fashioned ; when the petiole is in- 

 serted into the disk of the leaf, and not into the base or 

 margin; as in Nymphaea, Herriandia and Colocasia. 



Petiolate ; when there is a petiole fastened to the 

 leaf at the margin of the base. 



Sessile, squat ; when the leaf has no petiole, but 

 is fastened immediately to the stem. 



Decurrent, running down ; when the base of a 

 sessile leaf extends itself downwards along the stem 

 beyond the proper base or termination of the leaf; 

 as in Verbesina, Carduns and Sfjhae rant hus. 



Amplexicaul, embracing the stalk ; when the base 

 of the leaf embraces the sides of the stem cross- wise 

 on both sides; or, Semiamplexicaul, half embracing 

 the stalk ; which only Differs from Amplexicaul, in 

 that it is in a less degree. 



perforate ; when the base of the leaf is continued 



