DR. HOOKER ON THE DISTRIBUTION OF ARCTIC PLANTS. 345 



Beckmannia erucceformis, Host. The distribution of tliis plant is most extraordinary : 

 in Europe it is absent in the whole north, west, and central area, but extends from N. 

 Italy to Middle Eussia through Greece. In Asia it is found in Mesopotamia, Persia, 

 Caucasus, Siberia, N.E. Asia, and Japan. In America it inhabits the whole west coast 

 from Oregon to California, the Pi^ocky Mountains, the Saskatchewan, and passes down the 

 Mackenzie to beyond the arctic circle. It is absent in the North and Central United 

 States, but was found at St. Louis by Drummond. It is omitted in ' Mora Boreali- Ame- 

 ricana.' 



Agrostis alpina, Wahl. The alpina of Scopoli is kept distinct by Grisebach. Fries 

 includes a Lapland plant of Villars's of that name u.nder rupestris, AIL, as Lapponian. 

 Andersson reduces alpina, WahL, to rubra, and observes that it is a very northern 

 plant, hardly known out of Scandinavia. I follow Munro in bringing alpina under 

 rubra, L., though I must confess I do not see why in that case A. tmpestris, AIL, 

 should not follow. The true A. alpina of Scopoli, said to have been once found on the 

 Loffoden Islands, is excluded by Andersson. The true A. rupestris, AIL, according to 

 Blytt and Andersson, is not Scandinavian. 



A. alba, L. I follow Munro in uniting this {iwlymorplia, Huds.,) with vulgaris. 

 Grisebach keeps it distinct. 



Deteuxia and Calamagrostis. I have implicitly followed Munro in these genera, 

 being quite unable to arrive at any satisfactory conclusion regarding them. 



D. Canadensis, P. B. Durand is the only authority for this being a South Greenland 



plant ; but as he does not mention varia, strigosa, or lanceolata (all reputed Greenland 



plants), I hesitate to admit it. 

 D. neglecta, Bupr. and Ehr., is a synonym of s/ricte, according to Grisebach, Eries, and 



Andersson. It is kept distinct from Lapponica by all. 

 D. chalybcea, Eries, is kept distinct by its author and Andersson, who observes of it, 

 " C. Lapponicce simillima, sed non parum diversa." It is the Lapponica (3. chalybce-a 



of Lgestad. 

 D. pwpurascens, Br. Asa Gray refers this doubtfully to sylvatica, DC. (Mantial Bot. 



N. U. S.) ; Torrey more confidently (see ' Elor. Bor.-Am.'). 

 D. Grcenlanclica, E. M. This is one of Kunth's unknown species (Agrost. 239) re- 

 ferred here by Col. Munro. It is not referred to in Lange's Greenland list. It is 



also a Labrador plant, according to E. Meyer. 



B. montana. Host., is the Arundo varia of Wahlenberg. Eries gives the Baltic Islands 

 as its only Scandinavian habitat. 



D. Hartmanniana, Er., is kept distinct by Andersson and Grisebach ; but Eries con- - 

 siders it insufficiently established. Andersson says of it, " pulcherrima species, inter 

 Sallerianam et sylvaticam fere media ;" he places it next strigosa. I follow Munro 

 in bringing it under varia. 



D. aleutica. Bong. Kept up by Grisebach ; but CoL Munro considers it identical with 

 strigosa. 



D. Langsdorffii, Tr. Kept up by Grisebach, but considered by Munro the same with 

 purpurea. 



