100 LINN^EAN SYSTEM. 



second, according to the cohesion of the stamens to each other or 

 with the pistil, or according to their not cohering; third, accord- 

 ing to the relative length of the stamens ; fourth, according to the 

 number of stamens, &c. 



7. The first eleven classes are characterized by the number of 

 stamens. The names of these and the two succeeding classes are 

 formed from the Greek by prefixing the proper numerals to the 

 word aner (man), used metaphorically for stamen. 



Class 1. MONANDRIA : includes all plants with perfect flowers that 

 have but one stamen. 



2. DIAXDRIA : two stamens. 



3. TRIANDRIA : three stamens. 



4. TETRANDRIA : four stamens. 



5. PENTANDRIA: five stamens. 



6. HEXANDRIA : six stamens. 



7. HEPTANDRIA : seven stamens. 



8. OCTANDRIA : eight stamens. 



9. ENNEANDRIA : nine stamens. 



10. DKCANDRIA : ten stamens. 



11. DODECANDRIA : eleven to nineteen stamens. 



8. The two succeeding classes are characterized by the num- 

 ber of the stamens with their mode of insertion. 



12. ICOSANDRIA : twenty or more stamens which are attached 

 to or stand upon the calyx; as in the apple, cherry, &c. 



1 3. POLYANDRIA : twenty or more stamens which do not ad- 

 here to the calyx, that is, the stamens are hypogy'nous. 



9. The two following classes are characterized by the relative 

 length of their stamens : 



14. DIDYNA'MIA (from the Greek, dis, two, and dunamis, 

 power) : two long and two shorter stamens, as in mint. 



15. TETRADYNA'MIA (from the Greek, tetteres, four, and duna. 

 mis, power) : four long, and two short stamens, the longer 

 stamens are supposed to be the most powerful. 



10. The four following classes are characterized by the con- 

 nexion of the stamens. 



16. MONODE'LPHIA (from the Greek, monos, single, and del- 

 phos, brotherhood) : having the filaments of all the stamens 

 united into a set or tube, constituting a single brotherhood , 

 Example, the mallow. 



17. DIADB'LPHIA (from the Greek, dis, two, and delphos}' 

 having the filaments of the stamens united in two sets, as 

 in the pea. 



7. How are the first eleven classes of the Linnsean system named and 

 characterized ? 



8. How is the class Icosa'ndria characterized ? How is the class Poly, 

 andria characterized ? 



9. How is the class Didyna'mia recognised ? What are the characters 

 of the class Tetradyna'mia ? 



10. What are the characters of the class Monodelphia ? What are tha 

 characters of Dia'delphia ? What are the characters of Polya'delphia f 



