1017 



The fight lies in the first instance between llie annuals and 

 the perennials, until the latter gain the upper hånd. Amongst the 

 perennials those species which propagate vegetatively will eventnally 

 prove the stronger, and drive away several of the more distinctly 

 tufted piants, such as Riimex obtiisifoliiis, R. domesticiis, Alopeciirus 

 geniculatus and Holcus lanatiis. 



The commonest of the annual species are the following: Gale- 

 opsis tetrabit, Stellaria media, Cardamine hirsuta [the form campestris 

 which is generally annual), Poa anniia and the annual form of 

 Montia lamprosperma. 



The following are the most frequent of the spot-bound peren- 

 nial species: Poa trivialis, Raniinculiis acer, Riimex acetosa, R. ob- 

 tiisifoliiis and R. domesticiis, Alopecuriis geniculatus, Holcus lanatiis, 

 Plantago lanceolata, Anthoxanthiim and Cerastium vulgare. Agrostis 

 viilgaris and Bellis are perennial species with limited powers of 

 vegetative propagation, while Raniinculiis repens and Agrostis sto- 

 lonifera are perennials with widely wandering runners and stolons. 



The occurrence and frequency of these species will be better seen 

 from some examples. 



1. The Bo of the parsonage in Kvalbo, S yde ro. 



a) The field where corn was cultivated last year. Dominant spe- 

 cies: Stellaria media, Cardamine hirsuta, Poa trivialis, Raniinculiis repens 

 and Cerastium vulgare; subdominant: Galeopsis, Rumex acetosa and 

 Poa annua; scattered: Bellis, Alopecurus geniculatus, Ranunculus acer 

 and Agrostis stolonifera. 



b) Another field, probably a year older, and with a moist soil. 

 Dominant species: Rumex acetosa, Ranunculus repens and Caltha; Poa 

 trivialis was subdominant, and the other species noted included Rumex 

 domesticus, Holcus lanatus, Anthoxanthum and Agrostis vulgare. 



c) A third, a young field, had as dominant species: Ranunculus 

 repens, Rumex acelosa and Poa annua; secondary species: Ranunculus 

 acer, Plantago lanceolata and Cerastium vulgare, with local patches of 

 Holcus lanatus, Poa trivialis, Anthoxanthum and Agrostis vulgaris. 



2. The Bo at the head of the Trangisvaag-fjord, Sydero; 

 field under cultivation last year. Dominant species: Stellaria media and 

 Galeopsis tetrahit; secondary species: Ranunculus repens, Poa trivialis, 

 P. annua, Holcus lanatus (isolated piants), Rumex obtusifolius (onlj^ 

 young piants with leaves), Agrostis vulgaris, Alopecurus geniculatus, also 

 some potato piants from tubers overlooked in gathering the crop. 



3. The Bo at Sjov, Stromo; field under cultivation last year. 

 The dominant species are: Alopecurus geniculatus, Poa trivialis and P. 

 annua. Stellaria media is subdominant; other species noted: Galeopsis, 

 Bellis, Ranunculus repens, Rumex domesticus, Brassica campestris and 

 Agrostis vulgaris. 



