PVTAMCAk 



/^f the order Liliales several species, belonging to differ- 

 ^^ ent families, advance to the arctic limit of forest 

 occasionally even crossing it, not attaining, however, a wider 

 distribution in the arctic territory where they do not belong. 

 We find also that they in the alpine regions do not, or only 

 occasionally, cross the limit of forest, cf. remarks in Schroe- 

 ter: Pflanzenleben p. 354 — 5. 



The principal of those species are the following: 



1) Veratrum album L. and the closely related V. viride 

 Ait. extend respectively in the river-valleys of Northern 

 Eurasia and Northern America to the coasts of the Arctic sea. 



2) Streptopiis amplexifolius (L.) D. C. is an E. Asiatic 

 — N. American forest plant; the fruit is a berry, and it has 

 probably, through the agency of hirds, been brought to the 

 subarctic copses of the southernmost part of Greenland. 



3) Lloydia serotina (L.) Sweet — closely related to 

 Gagea — advances on both sides of Bering's strait farther 

 into arctic territory than any of the others. Thus it is found 

 at Cape Lisburn and extends even as far as the purely arctic 

 New Siberian Islands. 



4) Allium schoeuoprasum L. (including A. sibiriciim L.) 

 is found in the island of Kolgujew, in the river-valleys of 

 N. Asia up to the Arctic sea, and on the north coast of 

 Alaska. 



