LINN J3 AN SYSTEM. 103 



13. In the first thirteen classes of the Linnsean system, the 

 orders are founded on the number of styles, and when these are 

 wanting, on the number of stigmas. The names of these orders 

 are formed by prefixing numerals from the Greek to the word 

 gynia, from gune (woman), metaphorically used for pistil. 



Order 1 . MONOGYNIA : 1 style, or sessile stigma. 



2. DIGYNIA : 2 styles, or sessile stigmas. 



3. TRIGYNIA : 3 " 



4. TETRAGYNIA : 4 " 



5. PENTAGYNIA : 5 " 



6. HEXAGYNIA : 6 " 



7. HEPTAGYNIA : 7 " 



8. OCTAGYNIA : 8 " 



9. ENNEAGYNIA : 9 " 



10. DECAGYNLA: 10 " 



11. DOUECAGYNIA : 12, or about twelve. 



12. POLYGYNIA: more than 12. 



The sixth, seventh, eighth, and ninth orders are very rarely found. 



14. The 14th class, Didyna'mia, contains two orders, named 

 and characterized as follows : 



GYMNOSPE'RMIA (from the Greek, gumnos, naked, and sperma % 

 seed) : has naked seed, commonly four in number. 



ANGIOSPE'RMIA (from the Greek, aggeion, a vessel, and sperma, 

 seed) : has the seeds, which are usually numerous, enclosed 

 in a seed-vessel. 



lo. The 15th class, Tetradyna'mia, has two orders, distin- 

 guished by the form of the fruit. 



SILICULO'SA : fruit a silicle or roundish pod. 

 SILIQUO'SA : fruit a silique. 



16. The orders of the 16th, 17th, and 18th classes are 

 founded on the characters of the first thirteen classes. Foi 

 example, the mallow, which belongs to the 16th class, Monodel- 

 phia, has more than 20 stamens, and therefore belongs to the 

 order Polyandria of that class. 



17. The 19th class, Syngenesia, has five orders, characterized 

 by the nature of the florets, whether perfect, separated, or barren. 



1. POLYGAMIA ^QUALIS has perfect florets, that is, furnished 

 with both stamens and pistils. Example, the thistle. 



2. POLYGAMIA SOPE'RFLUA has the florets of the disk perfect, 

 and those of the ray furnished with pistils only. Example, 

 the aster. 



13. On what characters are the orders of the first 13 classes e* the 

 Linnaenn system founded ? 



14. What are the orders of the class Didynamia ? 



15. What are the orders of Tetradynamia ? 



16. On what characters are the 16th, 17th, and 18th classes founded* 



17. What are the orders of Syngenesia ? 



