TAXONOMIC DIFFERENTIATION 97 



races may meet the same fate, but their describing has not been useless, as it 

 has stimulated further research. 



When all or at least most of our mountain species have been studied 

 carefully and in detail we shall certainly be able to draw more certain con- 

 clusions about the history of our flora. 



REFERENCES 



(Only a few recent papers and papers specially referred to are cited here. The problems 

 relating to the mountain flora of Scandinavia have been discussed so often that the pertinent 

 literature is easily found.) 

 HuLTEN, E. (1942). Flora of Alaska and Yukon. II. Acta Univ. Luiul. N.F. II, 37, 1, 



131-412. 

 HuLTEN, E. (1958). The Amphi-Atlantic plants and their phytogeographical connections. 



Kimgl. Sv. Vet.-Akacl. Hand!. 4, 7, 1. 

 HuLTEN, E. (1959a). The Tiisetum spicatiim complex. Trisetum spicatiim (L.) Richt., an 



Arctic-montane species with world-wide range. Sv. Bot. Tidskr. 53, 203-228. 

 HuLTEN, E. (1959b). Studies in the genus Divas. Sv. Bot. Tidskr. 53, 507-542. 

 Knaben, G. (1958). Papaver-studicr, med et forsvar for P. radicatiim Rottb. som en 



islandsk-skandinavisk art. Blyttia 16, 61-80. 

 Knaben, G. (1959a) On the evolution of the radicattmi-group of the Scapiflora Papavers as 



studied in 70 and 56 chromosome species. Part A. Cytotaxonomical aspects. Op. Bot. 



{Lund) 2, 3. 

 Knaben, G. (1959b) On the evolution of the mdicat um-group of the Scapiflora Papavers 



as studied in 70 and 56 chromosome species. Part B. Experimental studies. Op. Bot. 



{Lund) 3, 3 

 Love, A. (1947). Heimskautasveifgras {Poa arctica) R. Br.) fundid a Hornstrondum. 



Ndtfurufr. 11, 17-21. 

 Love, A. (1955). Cytotaxonomical notes on the Icelandic /'«/:'flrc/'. Nytt Magas. f. Bot. 4, 



5-18. 

 Love, A. (1962). Typification of Papaver radicatiim — a nomenclatural detective story. Bot. 



Notiser 115, 113-136. 

 Love, A. and D. (1961). Chromosome numbers of Central and Northwest European plant 



species. Op. Bot. {Lund) 5. 

 Nannfeldt, J. A. (1935). Taxonomical and plant geographical studies in the Poa laxa 



group. Synib. Bot. Ups. [1], 5. 

 Nannfeldt, J. A. (1937). On Poa jemtlandica (Almqu.) Richt., its distribution and possible 



origin. A criticism of the theory of hybridization as the cause of vivipary. Bot. Not. 



1937, pp. 1-27. 

 Nannfeldt, J. A. (1940). On the polymorphy of Poa arctica R.Br., with special reference 



to its Scandinavian forms. Symb. Bot. Ups. 4, 4. 

 NoRDHAGEN, R. (1931). Studien iiber die skandinavischen Rassen der Papaver radicatiim 



Rottb., sowie einige mit derselben verwechselte neue Arten. Vorlaufige Mitteilung. 



Berg. Mas. Art., Natiirv. r. 2. 

 Nygren, a. (1950). Cytological and embryological studies in ArcUc Poae. Symb. Bot. Ups. 



10, 4. 

 Nygren, A. (1955). Chromosome studies in the Poa laxa group. Ann. Roy. Agric. ColL 



Sweden 22, 359-369. 

 Pettersson, Bengt (1958). Dynamik och konstans i Gotiands flora och vegetation. Acta 



Phytogeogr. Siiec. 40. 



