208 



The floras of these two regions ought therefore to be among the 

 most recent in existence. The southern Alleghanies and adja- 

 cent Piedmont region, on the other hand, have probably been 

 continuously covered with vegetation ever since the Palaeozoic 

 period, a time long antedating the appearance of any species of 

 plants now living. 



Below are given the proportions of monocotyledons to the 

 total number of species of angiosperms in several parts of tem- 

 perate Eastern North America whose floras have been written up 

 with some care. After the name of each region are given the 

 author and date of the flora from which the statistics were de- 

 rived, and then the percentage of monocotyledons. It is of 

 course only native plants that are of significance in this connec- 

 tion, but in some local floras no distinction is made between 

 native and introduced species. So two columns of percentages 

 are given, one for native species alone and the other for native 

 and introduced. 



The regions in the first list are wholly included in the glaciated 

 region. 



Maine (Fernald, 1892), 



Vermont (Hrainerd, Jones & Eggleston, 1900), 



Essex County, Mas.sachusetts (Robinson, 1880), 



Middlesex County, Massachusetts (Dame & Collins, 1888), 



Worcester County, Massachusetts (Jackson, 1894), 



Amherst and vicinity (Tuckerman & Frost, 1875), 



Connecticut (Bishop, 1901), 



New Haven and vicinity (Berzelius catalogue, 1878), 



Southington, Connecticut (Hissell & Andrews, 1902), 



Cayuga Lake basin. New York (Dudley, 1886), 



Monroe County, New York (I'cckwitli & Macauley, 1896), 



Michigan (Heal, 1904), 



Minnesota Valley (MacMillan, 1892), 



New Jcr.sey is about half coastal plain and the remainder of the 

 state mostly glaciated. The corresponding figures for it (liritton, 

 1889) are 33.2 per cent, and 29.3 per cent. 



The following areas lie wholly in the coastal plain : 



N.ilivc and 

 Native Introduced 



Dismal Swamp and vicinity (Kearney, 1901), 3°-9 



Vicinity of Wilmington, N. C. (Wood & McCarthy, 1887), 28.6 



Okefmokee .Swam]) and vicinity (Harper, incd.), 29.3 



Native 



Native and 

 Introduced 





29 



35-7 



32-3 





30.6 



35 



30.6 





28.4 



34-3 



32.2 





30 



31 



29.2 

 28 





31.8 





30 





30 



28.4 



