466 BOTANY. 



monopetalous corolla which supports these organs, and which is 

 here called stameniferous, presents three modes of insertion, 

 1 . Hypogynous^ where the ovary is free and the stamina or corol- 

 la inserted around the circumference of its base. 2. Perigynous, 

 where the stamina or corolla are attached to the calyx at a cer- 

 tain distance from the base of the ovary. 3. Epigynous, in 

 which the ovary is inferior, and the stamina or corolla inserted 

 on its summit. The following table shows at one view the dis- 

 tribution of M. Jussieu. 



Diclinous, irregular, or truly unisexual ....'.'........'.'. XVl! 



From this tabular view it is evident that the dicotyledonous 

 plants form the greatest number of orders. In general their flowers 

 are hermaphrodite ; and the sixteenth order alone comprehends 

 plants truly 'unisexual. When among the other orders plants 

 occur of this description, these are to be considered as pro- 

 ceeding merely from the abortion of the stamina, of which the 

 rudiments are almost always to be found. Those vegetables 

 where the male and female organs occur on the same plant are 

 called Monoclinous ; and the others Diclinous. 



The following is an abridged view of the Natural Families of 

 Jussieu. 



I. The Acotyledonous plants of Jussieu correspond to the plants ' 

 without corolla, stamina, and fruit of Tournefort ; to the Cryptogamia 

 of Linnaeus; and to the Agamic plants of Lamarck. They are divid- 

 ed into two great sections or series. 1. Those which have leaves or 

 foliaceous expansions, as the Musci and Hepaticce ; and, 2. those 

 which are destitute of leaves, as the Alg&, the Lichens, the Hy- 

 poxylce, and Fungi. In Dr Greville's Flora Edinensis the Acotyle- 

 dones are divided into fifteen orders, viz. 1. FiJices ; 2. Lycopo- 

 dinece ; 3. Marsilacece ; 4. Equisetacece ; 5. Musci; 6. Hepatici ; 

 7. Characece; 8. Algce ; 9. Chcetiphoroidece ; 10. Lickenes; 11. jfify- 

 poxyla ; 12. Fungi; 13. Gastromyci ; 14. Byssoidece ; 15. Epi- 

 phytfs. 



