168 THE ARTIFICIAL SYSTEM. 



Class XXIV. CRYPTOGAMIA, plants in which the organs of fructification aro 

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



878. THE LINN.BAN 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 1. Monogynia, 1 style. I Order 7. Heptagynia, 7 styles. 



Order 2. Digynia, 2 styles. 



Order 3. Trigynia, 3 styles. 



Order 4. Tetragynia, 4 styles. 



Order 5. Pentagynia, 5 styles. 



Order 6. Hexagynia, 6 styles. 



Order 8. Octogynia, 8 styles. 



Order 9. Enneagynia, 9 style?. 



Order 10. Decagynia, 10 styles. 



Order 11. Dodecagynia, 12 styles. 



Order 12. Polygynia, more than 12. 



879. THE ORDERS OF CLASS XIV. depend upon their seed vessels. 

 Order 1. Gymnospermia Fruit four achenia, as in the Labiatae. 



Order 2. Angiospermia Fruit inclosing several seeds. 



880. THE ORDERS OP CLASS XV. also depend on the fruit. 

 Order 1. Siliculosa Fruit asillicle, as in pepper-grass. 



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



881. THE ORDERS OP 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 OP 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 2 . 

 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 OP CLASSES XX., XXI., XXII. distinguished in the same 

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



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

 andria three stamens, etc. 



884. THE ORDERS OP CLASS XXIII. are founded on the position of the 

 flowers relatively, thus : 



Order 1. Monoecia Flowers?, $, 9 on the same plant (Acacia). 



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



Order 3. Trioecia Flowers 5 , $, and ? , each on separate plants. 



885. THE ORDERS OP 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 2. Musci, mosses. 

 Order 3. Hepaticae, liverworta 



Order 4. Lichens, lichens. 

 Order 5. Fungi, mushrooms. 

 Order 6. Alga?, seaweeds. 



