— 304 — 



ceae takes place in a manner that in many respects is exclusively character- 

 istic of no other family than the Ericaceae (inch Rhodoraceae) . The only 

 character of the Empetraceae we do not find again in Ericaceae is, that 

 the flowers are unisexual; but in arctic regions the flowers of Empetrum 

 are more frequently hermaphrodite than unisexual (Mentz). Samuels- 

 son even thinks it possible to admit the Empetraceae in the Ericaceae — with- 

 out altering the diagnosis of this family. — In the system it would, in 

 my opinion, be best to keep the Empetraceae as an independent family 

 but to place it in the direct neighbourhood of the Rhodoraceae as a bio- 

 logically differing type. 



Indhold. Side 



Økologiske Forhold 253 



Følgeplanter 257 



Frøspredning og Spiring 258 



Skudbygning 260 



1. Kimplanten 260 



2. Knopskæl 262 



3. Bladstilling 265 



4. Bladenes Udviklingsfølge 270 



5. Dromiforandringer 272 



6. Forandringer i Bladstillingen hos andre Tokimbladede 272 



7. Aarsager til de forskellige Stillingers Fremkomst 274 



Skududvikling (»St. Hansskud«) 277 



Forgrening 281 



Det florale Skud 281 



1. Aksetallet II 281 



2. LøfceZi'a-Diagram? 288 



3. Blomstens inderste Dele 291 



Systematiske Forhold 294 



1. Empetraceernes Inddeling 294 



2. Slægtskab med Bicornes (Samuels s on)? 295 



3. De nærmeste Slægtninge 297 



Litteratur 299 



Summary 301 



