Classification. xlv 



truly monopetalous, bearing the stamens, or is with the latter 

 hypogynous. 1 



(4.) In many orders there are some genera or species 

 without petals, especially in Ranunculacese, Sterculiaceaa, and 

 Sapindacese. 



Polypetalous Exogens include the first three sections given 

 below. 



I. THALAMIFLORJ;. (Orders Ranunculaceas to Tiliaceae.) 



Sepals generally distinct, free from the ovary. Torus small, 

 rarely expanded into a disk ; petals inserted on the torus, and 

 therefore below the ovary, or more rarely on the base of 

 the calyx ; stamens indefinite or definite, inserted as the 

 petals, free from them, or slightly cohering at the base. 

 Ovary superior. 



Exceptions. (1.) The ovary is included or immersed in a fleshy 

 torus in some genera of ^ymphseacese. 



(2.) The calyx tube is to some extent connate with the torus 

 and ovary in Portulacese. 



(3.) A cup-shaped disk bearing petals and stamens free from 

 the ovary, but adnate to the base of the calyx, is found in a 

 few genera of various orders. 



(4.) The torus is expanded into a disk in some genera of 

 Capparideaa, Bixineae, and Tiliacese. 



II. DISCIFLORJ:. (Orders Lineae to Moringese. 2 ) 



Sepals either distinct or partly united into a calyx, generally 

 small and free from the ovary. Torus generally expanded into 

 a disk. Petals generally equal in number to the sepals, or 

 fewer by abortion. Stamens generally equal in number to the 

 petals, sometimes double as many, or fewer by abortion, in- 

 serted round or within or upon the disk. Ovary generally 

 superior or immersed in the disk. 



Exceptions. (1.) In Linese, Malphigiacese, Zygophyllaeeae, 

 Geraniaceae, and Ilicineae, the disk is either absent or in- 

 conspicuous. 



(2.) The stamens are indefinite in Ochnacese. 



(3.) The ovary is inferior or nearly so in some of the 

 Rhamnaeese and Olacineae. 



1 I am not aware that there is any instance in this book of a plant 

 coming nnder this exception. 



2 These orders are generally found under Thalaminoree, and were 

 first made into a separate division by Bentham and Hooker. 



C 



