ALPINE FLORA AND FERNS OF NORWAY. 301 



ISLANDICA, L. ; Fl. D. tab. 418. Occasional on boggy 

 places over the whole Fjeld, e. </., near the old high-road over 

 Harbakken, by the road between Volaso and Jerkin; by Jerkin, 

 Kongsvdd, and in Drivdal. First appears a little above the fir- 

 limit, and mounts up beyond the limit of birch. 



THYMELE.E. 



DAPHNE MEZEREUM, L. ; Fl. D. tab. 268. On Harbakken, 

 above Rustgaard, at about the birch-limit. 



EtfPHORBIACE-E. 



EUPHORBIA HELIOSCOPIA, L. ; Fl. D. tab. 725. Up to the 

 corn-limit, by Tofte. 



URTICE^E. 



URTICA UREXS, L. ; FL D. tab. 739. By mountain cabins. 

 U. DIOCIA, L. ; FL D. tab. 746. As the last, but more com- 

 mon. 



AMENTACEJE, 



BETULA GLUTINOSA, or B. verrucosa, Ehrh., "Wallorth ; Fl. D. 

 tab. 1,4G7. Professor Blytt places its limit at 3,241 feet on the 

 Rondfjeld, adjoining the Dovre, and on Vaarstien at 3,193 t feet. 

 N.B. The limit of birch is reckoned by this species. 



B. ALPESTRIS, Fries. Occasional on the Dovre ; grows on 

 Knudshoe. Rare. 



B. HUMILIS, Hartmann. Occasional on the Fjeld. First appears 

 a little below the birch-limit, and mounts up to 100 feet above 

 it. 



B. NANA, L. ; Fl. D. tab. 91. Grows highest up of all the birch 

 tribe, to the limit of lasting snow ; has a very stunted and creep- 

 ing form. 



ALNUS IKCANA, L. ; Fl. D. tab. 2,301. Mounts 200 to 300 feet 

 above the lir-limit in Drivdal. 



A. POBESCENS, Tausch. Found in moist places in Drivdal and 

 Nystudal. 



POPULUS TREMULA, L. Grows as a bush, 2 to 3 feet high on 

 the Fjeld side a little above Kongsvold. Near Drivstuen it 

 attains a tolerable height, some 100 feet above the fir-limit. 



SALIX PEXTANDRA, L. ; Fl. D. tab. 943. Between Tofte and 

 Dombaas, and by Drivstuen. 



