80 The Vegetation of the 



From North 23. 



Viburnum Opulus. Salix cordata. 



Achillea millefolium. Salix myrtilloides. 



Senecio aurea. Sparganium eurycarpum. 



Taraxacum dens leonis. Triglochin palustre. 



Arctostaphyllosuvaursi. Triglochin maritimum. 



Lysimachia thyrsiflora. Habenaria hyperborea. 



Utricularia intermedia. Eleocharis palustris. 



Veronica scutellata. Eriophorum gracile. 



Lycopus sinuatus. Rynchospora alba. 



Stachys palustris. Carex limosa. 



Polygonum aviculare. Poa compressa. 

 Salix Candida. 



In common with the Eastern Continent, our flora contains 114 spe- 

 cies; of these six (Ranunculus maltifidus, Claytonia virginica, Mitella 

 diphylla, Artemisia biennis, Bromus ciliatus and Adiantum pedatum) 

 extend only to East Siberia and not farther westward. 



Of the 116 species, which, after A. de Caudolle (Geographic Botani- 

 c[ue, p. 564), are widely distributed, our flora contains thirty-two, all 

 European, except Eclipta alba, a tropical plant, and Erigeron canadense, 

 an immigrant in Europe. 



Species that are found in Australia (Hooker's Introduction to the 

 Flora of Australia) we have twenty-five, in Guyana (Schomburgk) are 

 twenty-three, and Grisebach's West Indian plants contain fifty of our 

 flora. 



Only three species extend to the polar region of Northern Greenland: 

 Habenaria hyperborea, Calamagrostis canadensis and Bromus Kalmii. 

 Besides those three forty-six more extend to the artic circle. 



The distribution of our species over the natural floral districts of N. 

 America will show in the following tables: 



