GEOGRAPHICAL DISTRIBUTION 



155 



of the Honeysuckle family, is represented in the eastern 

 United States and Canada by the bush-honeysuckle 

 (Diervilla Lonicera), and in the mountains of the southern 

 States by D. sessilifolia and D. rivularis; it is not found 

 elsewhere except in eastern Asia, where it is represented 

 by the shrubs commonly cultivated in temperate America 

 under the name Weigela. 



In the herbarium of the Brooklyn Botanic Garden are 

 two specimens of the cloud-berry, or mountain bramble 

 (Rubus chamamorus) , collected in a bog near Montauk 



FIG. 72. Map showing the geographical distribution of the skunk- 

 cabbage, Symplocarpus f&lidus. (After M. L. Fernald.) 



Point, Long Island, by Dr. William C. Braislin, in 1908. 

 This is an arctic and sub-arctic bog plant, ranging from 

 Labrador and Newfoundland to New Hampshire, British 

 Columbia, and Alaska; also in Europe and Asia. It was 

 found on the Peary arctic expedition as far north as Lat. 

 64 15' north. Its discovery as noted above was unex- 

 pected, and affords an interesting example of discontinuity 

 of distribution. Another striking illustration is the "curly 

 grass" fern (Schizcea pusilla) , of the Polypodiaceae, found in 

 Nova Scotia and Newfoundland, and in the pine barrens of 

 southern New Jersey, but not known to occur between 



