HOOKEU ON ARCTIC PLANTS. 



20; 



northern, and almost or wholly confined to the Arctic zone, are 

 the following, j indicates those species absolutely peculiar ; jf the 

 only peculiar genus. 



Ranunculus Pallasii. 

 II. hyperboreus. 

 TroUius Asiaticus. 

 Corydalis glauca. 

 Cardamine purpurea. 

 Turritis mollis. 

 Cochlearia sisymbrioides. 

 Hesperis Pallasii. 

 Braya pilosa. 

 Eutrenia Edwardsii. 

 Parrya arctica. 

 P. arenicola. 



Odontarrhena Fischeriana. 

 Sagina nivalis. 

 Steliaria dicranoides. 

 Oxytropis nigrescens. 

 Sieversia Rossii. 

 S. glacialis. 

 Rubus arcticus. 

 Parnassia Kotzebuei. 

 Saxifraga Eschseholtzii. 

 S. serpyllifolia. 

 S. Richardsoui. 

 Ccenolopliium Fischeri. 

 Nardosmia glacialis. 

 Artemisia Richardsoniana. 

 A. glomerata. 

 A. androsacea. 

 Erigeron compositus. 



Chrysanthemum arcticum. 



Pyrethrum bipinnatum. 

 f Saussurea subsinuata. 



Campanula uniflora. 



Gentiana arctophila. 



G. aurea. 



Eutoca Franklinii. 



Pedicularis flammea. 

 t Douglasia arctica. 

 f Monolepis Asiatica. 



Betula fruticosa. 



Salix speciosa. 

 t S. glacialis. 



S. phlebophylla. 



S. arctica. 



Orchis cruenta. 



Plantanthera hyperborea. 



Carex nardina. 



C. glareosa. 



C. rari flora. 



Hierochloe pauciflora. 



Deschampsia atropurpurea. 



Phippsia algida. 



Dupontia Fisheri. 



Colpodium pendulinum. 



C. fulvum. 



C. latifolium. 

 I f Pleiu-opogon Sabini. 

 t Festuca Richardsoni. 



ni. — Distribution of the Arctic Flowering Plants in 

 VARIOUS Regions of the Globe. 



There is but one distinct genus confined to the Arctic regions, 

 the monotypic and local Pleuropogon Sabini ; and there are but 

 seven other peculiarly Arctic species, together with one with 

 which I am wholly unacquainted, viz., Monolepis Asiatica. The 

 i-emaining 762 species are all found south of the Circle, and of 

 these all but 150 advance south of the parallel of 40° N. lat., 

 either in the Mediterranean basin, Northern India, the United 

 States, Oregon, or California ; about 50 are natives of the moun- 

 tainous regions of the Tropics, and just 105 inherit the South 

 Temperate zone. 



The proportion of species which have migrated southwards in 

 the Old and the New World also bear a fair relation to the 



