38 H. G. SIMMONS. [SEC. ARCT. EXP. FRAM 



There is. however, also a number of species so distributed as to 

 make it rather difficult to form a definitive opinion as to whether they 

 an- to he referred to the american or to the ubiquitous plants. 



Such are from Group I. 1 : 



I. Arnica alpunt, as it seems most widely spread on the Ame- 

 rican >ide and absent from Southern Greenland. In Ellesmereland it is 

 nut found in the Hayes Sound region. 



1. Pedicnlaris hirsula, circumpular hut absent from Southern 

 ( iivenland. 



3. Chamaenerium lati folium, lacking in Western Siberia, Scan- 

 dinavia and Spitsbergen, but appearing in Iceland. If this plant is to 

 be counted as american in Greenland, it should have reached Iceland 

 from the west. Here, however, as in some other cases also, two diffe- 

 rent ways of immigration may be possible. 



4. Potent-ilia pulchella, only south to the Disco region, and absent 

 from Western Siberia and the European Continent. 



5. P. emargiiiata, similarly distributed as the last. 



6. Braya purpnrascens, circumpolar, but only found about 70 

 in Danish West Greenland. 



7. Eiitrema Edwardsii, circumpolar, but, very sporadic in Green- 

 land. 



8. Ranunculus affinis, circumpolar. but only in a single place in 

 Danish West Greenland. 



9. Melaixlrinm apetalmn, circumpolar, but only spread southward 

 to the Disco region. 



10. Salix ardica, absent from Spitsbergen and the European 

 Continent, and represented in Greenland mostly by the VB.T.Brownii t which 

 i- principally american, and the var. groenlandica. 



II. Luzula ttivalis, absent from Southern Greenland. 



12. ('arex nardina, absent from Arctic Asia and Novaja Semlja. 

 but appearing again in Northern Finland, Scandinavia and Spitsbergen. 



\'-\. I)u]>o)itia Fisheri, circumpolar, but only sparingly represented 

 in Greenland, where it is lacking in the south. 



14. Poa al'lifrrirtta, most probably an american plant and absent 



I i A-ia, but appearing again in Spitsbergen, Fran/ Joseph Land, and 



Novaja Semlja In Danish Greenland its southern limit is at the Disco 

 region, and in East Greenland at Scoresby Sound. 



\~>. Ax/iii/hun frutjritus, entirely absent from Europe, and with a 

 norlhrrly distribution in W. Greenland, absent from E. Greenland except 

 lor Scoresby Sound. 



