1s INTRODUCTION. 
Cuass XXII. Dicascta. Stamens and pistils not only on two flowers, 
but these flowers on two different plants. Orders Monandria, Diandria, 
Triandria, Tetrandia, Pentandria, Hexandria, Octandria, Enneandria, 
Decandria, Dodecandria, Icosandria, Polyandria, and Monadelphia. 
Cuiass XXIII. Poryeamia. Stamens and pistils separated in some 
Jlowers, united in others, either on the same plant or on two or three 
different ones. Orders Moneecia and Dicecia. 
CHARACTERS OF LINNZAN ORDERS. 
18. The Orders or sub-divisions of the classes are generally founded 
upon the number of the styles or (if these be not present) 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. Monoeynia, One style. 
2. Dieynia, Two styles. 
3. Trieynia, Three styles. 
4, TerraGynia, Four styles, 
5. PEnTaGynia, Five styles. 
6. Hexaeynia, Siz styles. 
9. ENNEAGYNIA, Nine styles, 
10. Decaeynia, Ten styles. 
11. Dopecaeynia, — Twelve styles. 
12. Potyeyni, More than twelve styles. 
19, It will be evident from the description of the structure of the 
pistil, 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 ; whilst the styles and stigmata 
may be numerous. The structure of the ovarium itself is however 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 Dipy- 
NAIA, the characters of the orders are drawn from the structure of the 
seed-vessel. The first Gymnospermia, or naked-seeded, includes those 
