CLASSES OF LINJST^CS. 



19 



LECTUEE lY. 



THE CLASSES AND ORDEES OF LINN^US. 



20. All plants are arranged in two grand divisions ; Plie- 

 nogamo'us^ stamens and j)istils visible ; and Cryptogamoiis^ sta- 

 mens and pistils not visible. The former division includes the 

 first 20 classes ; the latter division, the 21st or last class. The 

 CLASSES £ive. founded upon distinctions observed in the Stamens. 

 All knov\^n plants are divided into tweiity-one classes. % The first 

 twelve classes are named by prefixing Greek numerals to 

 ANDELi, which signifies stamen. - 



Number of Stamens. 



Fig. G. 



Number of Stamens. 



19. Latin and Greek numerals.— 20. Two grand divisions o£ plants— Classes, on what founded 

 ho-.v inaiiv ?— first twelve, how uvimed ? 



