THE DEHISCENCE OF ANTHERS BY APICAL PORES. 219 



• 



anthers, inserted on short, thick filaments, are connivent 

 in a cone, through the center of which passes the style. 

 Dehiscence is at the apex by pores which may be continued 

 longitudinally. The pollen is dry and smooth, and neces- 

 sarily falls upon the ventral surface of the visiting insect 

 at the moment when it grasps the staminal pyramid. In 

 order that the insect may cling to the staminal column 

 the expansion of the flower is generally considerable. 

 Iscctar is absent or present only in small quantities. In 

 the former case the bee collects only pollen. This type 

 is exclusively melittophilous, "e sorprendentemente si 

 ripete co' suoi essenziuli earatteri in molte fauiiglie di 

 piante, cio£' nelle Boraginee, Primulacte, Solanacee, 



Cf 



>fulariacee, Amarillidee , Asparaginee, P 



Loasacee" 



In this type he places, with comments upon many forms, 

 B or ago officinalis, Cyclamen europaeum, C.coum, C . per- 

 sicum and other species, Dodecatheon Meadia, B. integri- 



folium, Solarium Bulcamara, S. nigrum, S. 

 S. Lycopersicum, S. insanum and many other 

 the genus, Verbasciim Myconi, Galanthus niva 

 jum vernum, Conantliera bifolia, Cajophorala 



species of . 



Solly a linearis, D 



and other species of this genus. 



Delpino's division of floral forms into fixed categories 



M uller 



the most severe criticisms 

 Without intendiug an eval- 



uation of the classification as a whole I must say that it 

 seems to me that Delpino's generalizations for this type 

 have been very satisfactorily substantiated by the obser- 

 vations which have been accumulated since his essay ap- 

 peared. In their 



Solanum 



ment with Delpino's Borago type. For the purposes of 

 this paper the classification is extended so as to include the 

 7:voromornhic forms so common in Cassia and occurring in 



