ON SYSTEMS AND CLASSIFICATIONS. 11 



neous pappus. The twelfth class contains plants with verticillated 

 flowers, that at the same time have a corolla of four petals and two 

 naked seeds. Under the thirteenth class are arranged all the rough- 

 leaved plants, that bear a monopetalous tubular corolla, and four 

 naked seeds. To the fourteenth belong the labiated or ringent 

 flowers. In the twenty fourth class stand all the Lilies. To the 

 twenty-fifth belong all the Grasses, and to the twenty-sixth those 

 which cannot be reduced muter any of the foregoing. 



Camellus has attempted a very singular system, framed from the 

 valves of the capsule and their number. It is not, however, on 

 account of its shortness, of great use. 



1. Pencarpia Afora. 5. Pericarpia Tetrafora. 



2 Unifora. 6 Pentafora. 



3 Bifora. 7 Hexafora. 



4 Trifora. 



Rivinus selects only the corolla, the regularity of the petals, and 

 their number. 



} lores regular es. Hores regular es, 



1. Monopetali. 5. Pentapetali. 



2. Dipetali. 6. Hexapetali. 



3. Tripetali. 7. Polypetali. 



4. Tetrapetali. 

 Flures compositi. 



8. Kx flosculis regularibus. 



9. E\ rlosculis regularibus et irregularibus. 

 10. Ex ilosculis irregularibus. 



Flore s irrtgulares. Flares irregulares. 



11. Monopetali. 15. Pentapetali. 



12. Dipt ali. 16. Hexapetali. 

 . 13. Tripetali. 17- Polypetali. 



14. Tetrapetali. 18. Flores incomplete Imperfecta 



This system is very easily understood, and the selected character 

 is to be found without any trouble. But the regularity of the 

 corol, which often varies in the different species of a genus, aiid / 

 the number of petals, which iikewise not unfrtquentlv vary, make it 

 difficult in practice. The orders are taken from the fruit according 

 as it is naked, (fructus nudus), or contained in a pericarp ; and 

 this last is distinguished according as it is dry Q>e"icarpium siccum), 

 or (pericarpium carnosum). 



