134 AN INTRODUCTION 



Striate, streaked ; when the surface is cut in, or 

 scored longitudinally with parallel lines. 



Pappillose, nipply ; when it is covered with vesicles, 

 little bladders. 



Punctate, dotted ; when it is besprinkled with hol- 

 low points or dots. 



Nitid, bright ; when the smoothness of the leaves 

 causes them to shine. 



Plicate, plaited ; when the disk of the leaf rises 

 and falls in angles towards the margin ; as in Alche- 

 milla. 



Undulate, waved ; when the disk of the leaf rises 

 and falls in convexities towards the margin. 



Crisp, curled, when the circumference of the leaf 

 becomes larger than the disk admits of, and is here- 

 by forced to undulate. All curled leaves are monsters. 



Rugose, wrinkled ; when the veins of the leaves 

 contract into a narrower compass than the disk, so 

 that the substance between them is obliged to rise ; 

 as in Salvia. 



Concave, hollow ; when the margin of the leaf 

 contracts, and becomes less than the circumscription 

 of the disk, by which means the disk is depressed. 



Venose, veiny ; when the vessels are branched all 

 over the leaves, and their anastomose * or joinings 

 arc plain to the naked eye. 



Nervose ; when they have simple unbranched ves- 

 sels, that extend themselves from the base to the apex. 



Coloured ; when they change their green for some 

 other colour; as in Amaranthus tricolor f. 



Glabra, smooth; when the surface is void of all 

 inequality. 



-The SUBSTANCE of a leaf respects the conditions 

 of its sides : In this respect )eaves are, 



* A term in Anatomy, expressing the mouths or orifices of 

 veins and arteries ; or in other words, the part where they 

 jjnite, and the blood is discharged from the one into the qther* 



f Three-coloured, 





