60 



NATURAL CLASSES. 



and Agardh on the two divisions of Algas hav^ 

 led to this. Agardh irt his excellent Systema 

 Algaruin 1821 has in fact divided the aquatic 

 Algas into G orders and 101 Genera, altho' he 

 has omitted iny P/iysldria family, besides the 

 Spunges that are real plants. 



Thus we may double my 10 Classes into 20 

 equaly Natural, and this is the extent of Classi- 

 fication we may venture to admit. If we were 

 to have more, or 40 and 50, they would be in 

 fact mere Orders by a different name. If the 

 Cactoides were more numerous they might 

 perhaps form a Class also ; but they are very 

 akin to Myrtus and Rihes. Having thus re- 

 vised and rectified my own Classes, I shall pre- 

 sent their tabular analytical View in Latin. 

 Series I. EXOGENIA. Rosa prim. G. 



Classis, 1. POLYGIA, Pistilis plurimis lib- 

 eris, vel petalis staminisque anomalis, Stam 

 plurima S. paucis alternantis, &. libera. Ord. 1, 

 2, 3 ut supra. Rosacea, Sedoides, Ranuncula- 

 cea, &.C. auctoris. 



2. ELTROGIA, Pistil, liberum unicum, pe- 

 talis regularis vel nullis, perigono vel lepigono, 

 stam. plurima s. paucis alternantis liberis, fructo 

 vario non legumen &.c. — Ord. 4, 5, 7, 8, 9, 10, 

 11, Crucifera, Caryophylea and alia Ord. auc- 

 toris. 



3. SYNANDRIA, Pistil, plurimis s. unic. 

 liberum. Stamina plerumque coalitis, vel fructo 

 legumen. Corolla varia regularis s. papilionacea 

 — Ord. 12, 13, 14 15, ut supra. Leguminosa di- 

 videnda inter Ord. Papilionaria,Lomentaria,Mi- 

 mosaria ? Genera Fiimaria., Melia, Malva^ 

 Geranium &c. ad fructo solo distinguenda. 



4. HETEROLIA, Stam. paucis ad corolla 

 peripetala insertae adnatis, alternantis s. hete- 



