152 CAPRIFOLIACEOUS TYPE [CH. 



leiina and Menziesia, the corolla is regular and the flower 

 actinomorphic throughout. 



But in Azalea and Rliododendron the corolla is more 

 or less distinctly zygomorphic, and the stamens may be 

 reduced to five. 



Thus we see that the floral formula of the Ericoid 

 type may vary in detail as follows : 



K{h) G{o) .4 I 5 + 5 (t(5), e.g. Arhutus. 



K(5) C(o) A\ + G(o), e.g. Vaccinium. 



7t(4) C(4) ^ I 4 + 4 G(4), e.g. Erica. 



K(5)\C{o) ^ I + 5 G(5), e.g. Azalea. 



In spite of these and other small variations in detail, 

 however, it is clear that we have in the Ericoid flower a 

 good type capable of expression in the general formula 

 K^n) G(n) ^2^^ G(;n), where n represents 4 or 5, and where 

 G may be superior or inferior ; while G may be zygo- 

 morj)hic and one whorl of the double series of stamens 

 may be suppressed. Such details as the absence of awns 

 from the anthers, the capsular or fleshy fruit, &c., may be 

 regarded as details to be referred to in the special part of 

 this volume. 



As a final floral type, also presenting a number of 

 interesting variations in detail, I select that of the 

 Capri foliacesB, the family which includes the Honey- 

 suckles, Elder, Wayfaring Tree, Guelder Rose, and Snow- 

 berry. 



The general structure of the flower is very similar 

 throughout. It has a completely inferior rounded ovary 

 bearing five epigynous sepals, a five-lobed or five-partite 

 gamopetalous corolla, also epigynous, on the tube of 

 which are inserted five stamens alternating with the lobes 

 i.e. the androecium is epipetalous and isostemonous. 



