10 ARKIV FÖR BOTANIK. BAND 12. NIO 7. 



as to the pubescence, which, as far as I know, is only found 

 in hybrids or intermediate forms. It is not only a different 

 covering on the leaves of the outer and the inner ranges of 

 the rosella — this is nothing atypical in some species of the 

 genus Draba ■ — but one leaf is unlike the other nearest it, 

 and the cilia, which should constitute a characteristic, are 

 often entirely missing or only found imperfect on the inner 

 leaves. This form is mostly found in the North of Scandi- 

 navia as the Norvegian Nord landen and Finnmarken and 

 the Swedish Lapp-territories of Pite and Lule, where, on the 

 other hand, the true D. jladnizensis is rare. The opinion 

 which Lange pronounces 1. c. p. 40 and 41 shows that 

 this heterotrichous form in Greenland is very common. 



In consequence of the above considerations, it seems to 

 me the name of this form should be Draba lapponica Wg., 

 not Draba jladnizensis f. lapponica; — if it is not to be 

 designated: Draba jladnizensis — rupestis. 



There are again in Scandinavia two forms of D. Wahlen- 

 bergii f. homoiricha. The one, which we might call /. genuina, 

 has only cilia or simple hairs in the margin of the leaves. 

 By this character it corresponds also with the above men- 

 tioned specimens from the neighbourhood of Fladnitz and 

 with the illustration of v. Wulfen 1. c. The other form has 

 both simple hairs in the margins and on the surface of the 

 leaves, Draba lactea Adams ? (Memoires des Nat. de Moscou 

 V (1817) p. 104—105 and Icones Plant. Flor. Ross. tab. 200). 

 On the separate representation of the leaves some hairs are 

 found on the surface, and in Adams' description the leaves 

 are said to be: -»supra jere glabrce subtus et ad marginem pilis 

 simplicibiis hispida». Ought also this form to be called D. 

 jladnizensis Wulf, or is it to be regarded as an intermediate 

 form between this species and another one, or Draba alpina 

 L? It is true that such forms sometimes occur. I have 

 seen a great number of them, particularly from the shores 

 of the Arctic Ocean (collected in 1911 by the Rev. S. J. 

 Enander) where also J. M. F. Adams has gathered his D. 

 lactea. Buth these specimens of Mr Enander have all some 

 branched hairs, mixed with the more abundant simple ones, 

 and the style is somewhat longer. I am therefore inclined 

 to consider D. lactea and its corresponding Scandinavian 

 form of D. Wahlenbergii as a Northern subalpine form of 



