330 CHARACTERS OF LINN JS AN ORDERS. 



484. The Orders, or subdivisions of the classes, are generally 

 founded upon the number of the styles, or (if these be not pre- 

 sent) of the stigmas ; or upon certain peculiarities of the seed- 

 vessel. In the first thirteen classes, the number alone is regarded ; 

 and the orders are designated, as before, by the Greek numerals, 

 with the termination gynia, which refers to the supposed female 

 character of the pistil. 



Order 1. Monogynia, One Style 



2. Digynia, Two Styles 



3. Trigynia, Three Styles 



4. Tetragynia, Four Styles 



5. Pentagynia, Five Styles 



6. ffexagynia, Six Styles 



7. Heptagyriia, Seven Styles 



8. Octogynia, Eight Styles 



9. Enneagynia, Nine Styles 



10. Decagynia, Ten Styles 



11. Dodecagynia, Twelve Styles 



12. Polygynia, More than Twelve Styles. 



It will be evident, from the description of the structure of the 

 pistil formerly given (. 434), that the number of styles affords 

 no indication of the character of the ovarium. Thus, the ovarium 

 may be formed of many carpels, the divisions between which 

 remain as distinct partitions, whilst the styles and stigmata of all 

 these may have coalesced into one pillar ; so that we may have 

 a single style with a many-celled seed-vessel. On the other hand, 

 the walls of the carpels may form but incomplete partitions, so 

 that the cavity of the ovarium is undivided (Fig. 50) ; whilst 

 the styles and stigmata may be numerous. It will hereafter be 

 shown that the structure of the ovarium itself is a much less 

 variable character than the number of styles, which is liable to 

 alteration in many species (like that of the stamens) through the 

 adhesion or the non-development of some of them. In the class 

 DIDYNAMIA, the characters of the orders are drawn from the 

 structure of the seed-vessel. The first, Gymnospermia, or naked- 

 seeded, includes those in which the ovary has four carpels, each 

 enclosing a single seed ; and this, when mature, fills up the cavity 

 in such a manner, that the wall of the seed-vessel appears like 

 an outer coat to the seeds, which thus do not seem to have any 



