IY. MONOPETALOUS EXOGENS. 



PLANTS having a corolla with united petals, the stamens 

 inserted on it, and very generally definite in number. 



The thirty orders which are included in this great division 

 of plants can be separated for the most part into two very 

 distinct groups 



1. Flowers, generally regular, with 4 or 5 stamens, and the 

 same number of calyx and corolla lobes ; the stamens as a rule 

 alternate with the corolla lobes. 



2. Flowers with an irregular 2 -lipped corolla, and either 2 

 or 4 (didynamous) stamens, generally the latter. 



Note 1. It must be remembered that in many cases, particularly 

 in the earlier orders of this division, the petals are united very low 

 down, and so may at first sight easily be looked on as separate. 



Note 2. Throughout this division the stamens are on the corolla, 

 except when otherwise stated. 



CONSPECTUS OF ORDERS. 



I. STAMENS 4 or 5 : LOBES OF CALYX AND COROLLA AS MANY. 

 (a) Stamens 5, corolla regular. 



67. PLUMBAGINE^. Herbs or undershrubs ; ovary superior. 



68. PEIMULACEJE. Herbs. 



69. MYRSINE^;. Shrubs or trees, leaves alternate undivided, 



without stipules. 



75. APOCYNEJE. Generally shrubs, leaves opposite entire, 



without stipules ; fruit often of 2 follicles. 



76. AscLEPiADACEJ3. Generally twiners with milky juice ; 



stamens combined into a mass, fruit of 2 follicles. 



81. CONVOLVULACE^. Twiners, leaves alternate, ovary 



superior. 



82. SOLANACE^E. Herbs or shrubs, leaves alternate, without 



stipules. 

 (6) Stamens 5, corolla irregular. 



65. GOODENOVLSJ. A shrub, corolla oblique. 



66. CAMPANULACE^:. Tribe Lobelieae. Herbs, ovary inferior, 

 (c) Stamens 4 ; flowers regular. 



