xlvi Classification. 



III. CALYCIFLOR^E. (Orders Connaraceae to Cornaceae.) 

 Sepals generally more or less united into a tube adnate to 



the ovary, very seldom altogether free ; disk rarely apparent. 

 Petals generally equal in number to the sepals, or fewer by 

 abortion, inserted on the top of the calyx tube. Stamens 

 definite or indefinite inserted on the calyx ; ovary generally 

 inferior, or included in the calyx tube, but occasionally ex- 

 serted. 



Exceptions,. (1.) There is no calyx tube in a few genera of 

 Leguminosse, Rosaceae, Samydacese, and Ficoideae. 



(2.) In Myrtaceae, Umbelliferae, and Araliacese there is a 

 conspicuous disk. 



IV. The next division of Exogens is MONOPETAL^E. (Orders 

 Rubiaceae to Plantagineae.) 



Petals within the calyx, more or less united into a lobed 

 corolla ; calyx generally persistent, of 4 or 5 sepals. Stamens 

 usually few, affixed to the limb of the corolla or sometimes 

 inserted with it. Leaves very rarely compound, generally, 

 except in Rubiaceae, without stipules. 



Exceptions. (1.) There are a very few genera, especially in 

 Oleaceae, with distinct petals, but easily distinguished from 

 polypetalous genera by other marks. 



(2.) The calyx is apparently obsolete, being quite adnate to 

 the ovary and without a limb in some Rubiacese and many 

 Compositse. 



(3.) In some of the Sapotaceae the lobes of the corolla are 

 double, and in Plantagineae the corolla is scarious. 



(4.) In Styracese and Ebenaceae the stamens are indefinite. 



V. The absence of corolla marks the last division of 

 Exogens. 



APETAKE or Monochlamyds. (Orders Nyctaginese to 

 Gnetaceae.) 



Plants without a corolla, the perianth generally without 

 strong colouring, its lobes or segments in one or two series 

 much alike. 



Exceptions. (1.) Flowers with true petals inside the calyx 

 are found in some genera of Euphorbiaeese. 



(2.) In some genera of Loranthacese the perianth is corolla- 

 like, and there is an expansion of the pedicel which takes the 

 place of calyx. 



