CLASSIFICATION. 



695 



THE ARTIFICIAL OR LINN^EAN SYSTEM OF CLASSIFICATION. 



In this system plants are divided into twenty-four classes; twenty-three 

 of these contain the Dicotyledons and Monocotyledons indiscriminately ; the 

 twenty- fourth class contains the Acotyledons. 



The first twenty-three classes are founded on the number, position, rela- 

 tive lengths, and connection of the stamens. The twenty-fourth comprises 

 the plants with inconspicuous flowers. Every class is subdivided again into 

 several orders. This division depends, in the first thirteen classes, on the 

 number of the styles ; in classes XIV. and XV. on the nature of the fruit; 

 in classes XVI. to XVIII. and XX. to XXII. on the number of stamens; in 

 classes XIX. and XXIII. on the perfection of the flower. In class XXIV. 

 the orders are formed according to natural affinities. 



TABULAR VIEW OF THE LINN^AN SYSTEM OF CLASSIFICATION. 

 A. FLOWERS PRESENT (Phanerogamid). 



I. Stamens and pistil in every flower (hermaphrodite). 



1. Stamens free. 



a. Stamens of equal length, or not differing in definite proportions. 



Number of Stamens 

 I 



2 



3 



4 

 5 

 6 



7 

 8 



9 



10 



ii 19 



20 or ? inserted on calyx 

 more 3 receptacle 



b. Stamens of different lengths, two long and two short 

 four long and two short 



2. Stamens united by filaments in one bundle 



in two bundles 



w in more than two bundles 



by anthers (compound flowers) 



with pistil on a column 



II. Stamens and pistil in different flowers (unisexual) on the 

 same plant ....... 



on different plants . . 



III. Stamens and pistil in the same or in different flowers, on the 

 same or on different plants ..... 



B. FLOWERS ABSENT 



Class i. Monandria. 

 2. Diandria. 

 3. Triandria. 

 4. Tetrandria. 

 5. Pentandria. 



6. Hexandria. 



7. Heptandria. 



8. Octandria. 



9. Enneandria. 

 10. Decandria. 



ii. Dodecandria. 

 12. Icosandria. 

 13. Polyandria. 

 14. Didynamia. 

 15. Tetradynamia 

 1 6. Monadelphia. 

 17. Diadelphia. 

 1 8. Polyadelphia. 

 19. Syngenesia. 

 20. Gynandria. 



21. Moncecia. 

 22. Dicecia. 



23. Polygamia. 

 24. Cryptogamia 



