114 



HARPER 



the native vegetation of the Altamaha Grit region, representing 

 it as it might have appeared a hundred years ago or more, before 

 civilized man began to tamper with it. There now remain to be 

 considered the 



Weeds. 



"Weed' ' is here used to denote a plant which is believed not to 

 be indigenous in the region, whether it is detrimental to the in- 

 terests of civilized man or not. The weeds of the Altamaha 

 Grit region are principally confined to yards, roadsides, and rail- 

 roads. (Plate XVII, Fig. i.) Very few of them invade culti- 

 vated fields, and none encroach on the territory of the native 

 plants except where the latter have been destroyed or weakened 

 by civilization. Weeds at present constitute about 10% of the 

 total number of species in the region, but probably only a 

 minute fraction of i% of the number of individuals. In other 

 words, most of them are not at all abundant. 



In the following list the species are arranged in systematic 

 sequence (in the same order as in the taxonomic part of this work) . 

 After the name of each is its frequency number, and then the 

 r egion where the species is believed to have originated. No 

 attempt is made to indicate duration, time of flowering, etc., as 

 was done in the treatment of the native plants. All but two of 

 them are herbs, and probably mostly annuals. 



Erechthites hieracifolia 



i 



North America? 



Achillea Millefolium 



5 



Europe? 



Anthemis Cotula 



5 



Europe 



Helenium tenuifolium 





Mississippi Valley? 



Bidens bipinnata 



i 



Mexico ? 



Acanthospermum australe 



oo 



Tropical America 



Gnaphalium purpureum 



2 



North America? 



obtusifolium 



I 



Eastern U.S.? 



Leptilon Canadense 



2 



North America? 



Erigeron ramosus 



I 



" " 



Isopappus divaricatus 



3 



Central U. S.? 



Iva microcephala 



6 



Southern U. S.? 



Ambrosia artemisisefolia 



2 



North America? 



Xant hium strumarium 



I 



" " 



Specularia perfoliata 



I 



" " 



Sambucus Canadensis 



I 



1 1 o 



Diodia teres 



r 7 



Eastern U. S.? 



Richardia scabra 



i 



Tropics 



Plantago aristata 



2 



Central U. S.? 



Veronica peregrina 



I 



Europe ? 



Scoparia dulcis 



I 



Tropics 



