16 



Leaves in whorls of four or more. RUBIACE^E, or (TALIACEJ:. p. 173. 

 Leaves opposite. Corolla lobes imbricate in the bud. 



CAPRIFOLIAOE,E. p. 169. 

 Leaves mostly alternate. 



Stamens four or five. Corolla lobes valvate in the bud. 



CAMPANULACE.K. p. '209. 

 Stamens five or many. Corolla lobes plaited in the bud. 



BELVISIACK.*:. 



POLYPETALOUS CALYCIFLORAL EXOGENS. 



22. Stamens not more than twelve. 29 

 Stamens more than twelve. 



Calyx adherent to the ovary. 25 

 Calyx wholly free from the ovary. 



Leaves with stipules. , 24 

 Leaves without stipules. 



Carpels combined into a single pistil, often with two or more stig- 

 mas. With more than one placenta. 23 

 Carpels more or less distinct, or single. 



Flowers more commonly imperfect. Ovule attached to the base of 

 the one-celled ovary. ANACARDIACE.*:. p. 84. 



Flowers perfect. Ovules either standing obliquely upward or 

 suspended from the apex of the cell. ROSACES, p. 115. 



23. Stigmas usually two or more. Calyx commonly of two sepals 

 cohering at base. Leaves more or less fleshy. 



PORTULACACE^E. p. 69. 



Stigma single, rarely two lobed. Calyx of more than two sepals, 

 tubular, remaining after the withering of the flower. 



LYTHRACE.E. p. 149. 



24. Carpels combined into a single pistil, with more than one pla- 

 centa. Placentas in the axis. Stigmas commonly two or more. 



PORTULACACEJ;. p. 59. 



Carpels more or less distinct, or single. When there are several 

 they are sometimes joined together in the fruit. 



