t6 An IntroduElion to 



The ifl clafs of fingle leaves. Plate II. 



Thofe leaves are called fingle, f.mplkiai 

 -whofe footftalks fupport but one. 



There are feven forts of fingle leaves, Vv'here 

 we confider a leaf according to its circumfe- 

 rences, f^nus, its borders, its furface, its fum- 

 mit, and its fabftance. 



The circumference {^clrtiimfcriptio) of i 

 leaf depends upon its border having vidfinusOT 

 angle 5 therefore v^^e fliould comprehend in 

 this title all thofe leaves vi^hofe figures are in 

 form of a ring differently comprefied, if they 

 have nojinus or angles* 



1. We call a leaf orbicular or round [orbi- 

 culum) whofe length and breadth are equal, 

 and whofe borders are equally diftant from the 

 center, as the SoUanella, fee fig. i . plate II. 



2. A roundlfli leaf (fubrotundum) is one 

 whofe breadth is greater than the length, fee 

 fig. 2. but this term is often ufed in a more 

 extenfive fenfe. 



3. An oval leaf [ovattmi) is in form of ant 

 egg, and is longer than it is broad; and 

 when the bafe or lower part forms a fegment 

 of a circle, but the upper part drav/s nearer 

 to a point, fee fig. 3. 



An obverfe oval leaf {obverfe-oijatum) is 

 one ia form of an egg reverfed, the fame as 



