168 THE ARTIFICIAL SYSTEM. 



Class XXIV. Cbtptogamia, — plants in which the organs of fructification are 

 concealed (as the name implies) as in ferns, mosses, seaweeds. 



818. The Linnjean orders. Each class is subdivided into orders, and these 

 also are founded on some condition of the essential organs. The orders of the first 

 thirteen classes are determined by the number of styles (or stigmas when the styles 

 are wanting) in each flower. 



Order 7. Heptagynia, 1 styles. 



Order 8. Octogynia, 8 styles. 



Order 9. Enneagynia, 9 styles. 



Order 10. Decagynia, 10 styles. 



Order 11. Dodecagynia, 12 styles. 



Order 12. Polyginia, more than 12. 



Order 1. Monogynia, 1 style. 



Order 2. Digynia, 2 styles. 



Order 3. Trigyina, 3 styles. 



Order 4. Tetragynia, 4 styles. 



Order 5. Pentagynia, 5 styles. 



Order 6. Hexagynia, 6 styles. 



879. The orders of class XIV. depend upon their seed vessels. 

 Order 1. Gymnospermia — Fruit four achenia, as in the Labiatse. 



Order 2. Angiospermia — Fruit inclosing several seeds. 



880. The orders op class XV. also depend on the fruit. 

 Order 1. Siliculosa — Fruit a sillicle, as in pepper-grass. 



Order 2. Siliquosa — Fruit a silique, as in wall-flower. 



881. The orders of classes XVI., XVII., XVIII. are distinguished by 

 the number of stamens and named like the first classes. 



Order 1. Triandria — three stamens united by their filaments. 

 Order 2. Pentandria — five stamens united by their filaments. 



882. The orders of class XIX are five, as follows : 

 Order 1. Equalis — Florets of the head all perfect ( ? )• 



Order 2. Superflua — Florets of the disk $ , of the ray ? . 

 Order 3. Frustranea — Florets of the disk $ , ray abortive. 

 Order 4. Necessaria — Florets of the disk $ , of the ray $ . 

 Order 5. Segregata — Each floret with a separate involucre. 



883. The orders of classes XX., XXL, XXII. distinguished in the same 

 way as the first thirteen, the XVI., XVIL, XVIII. classes ; as 



Order 1. Monandria— one stamen. Order 2. Diandria— two stamens. Order 3. Tri- 

 andria^ — three stamens, etc. 



884. The orders of class XXIII. are founded on the position of the 

 flowers relatively, thus : 



Order 1. Moncecia— Flowers S , $ , $ on the same plant (Acacia). 



Order 2. Dicecia— Flowers $ on one plant, $ , 2 , on another (Chamerops). 



Order 3. Tricecia— Flowers $ , $, and $> , each on separate plants. 



885. The orders of clAss XXIV. are the same as in the Natural Sys- 

 tem, and can not be defined by a single character. 



Order 1.' Felices, ferns. Order 4. Lichens, lichens. 



Order 2. Musci, mosses. Order 5. Fungi, mushrooms. 



Order 3. Hepaticse, liverworts. I Order 6. Algae, seaweeds. 



