Harper: Native weeds and their probable origin 351 



not sufficiently adapted to our conditions to spread. These, often 

 designated adventive or fugitive plants, * are confined chiefly to 

 habitats C and D, especially the latter. 



9. Cultivated plants, which are unable to compete with those 

 in the other groups, and grow only where they are planted and 

 protected by man, as in fields, gardens, hothouses, flower-pots, etc. 

 In the northeastern states probably nine tenths of the species of 

 this and the two preceding groups are of European origin. 



It is with class 6, the native weeds, that we are chiefly con- 

 cerned. A few lists of such plants for various parts of the eastern 



United States and neighboring territory have been published as 

 foil 



ows 



New Brunswick: Ganong, Bot. Gaz. 36 : 432,435- l 9°3'> 

 42 : 89-90, 98-99. 1 906. 



M 



J 



>nes, & Eggleston, Fl. Vt. 94. 1900. 



Massachusetts: Blankinship, Rhodora 5: 128, 135. 1903. 



Pennsylvania : Harshberger, Bull. Torrey Club 31 : 152-155, 

 1 36-1 58. 1904. 



Michigan : Beal, 5th Rep. Mich. Acad. Sci. (Mich. Flora) 27. 

 5904 ; F. B. H. Brown, Bot. Gaz. 40 : 277. 1905 ; Transeau, 

 Bot. Gaz. 40 : 435, 438, 440-441, 443"444> 446-447- ! 9°5- 



Illinois: Brendel, Flora Peoriana 36. 1887. 



Virginia: Kearney, Contr. U. S. Nat. Herb. 5: 407-409, 

 472. 1 901. 



Tennessee: Gattinger, Fl. Tenn. (ed. 2) 13-14- I 9° I - 

 Georgia: Harper, Bull. Torrey Club 27: 327-328, 329, 421. 



1900 » 30: 338. 1903; Ann. N. Y. Acad. Sci. 17: "4-n°- 



[ 9o6. 



M oh 



6 5 (middle). i 9 oi. 



Mississippi and Louisiana : Lloyd & Tracy, Bull. Torrey 



Club2 8:8 3 . I9 oi. 



, lt happens, however, that in all or nearly all of the lists just 

 CIted ther e is more or less admixture of exotics or of undisputed 

 " atlves - or both. To illustrate therefore just what kind of plants 

 0u ld call native weeds I offer the following examples, which I 



I 



Se 



'n this connection Mohr, Contr. U. S. Nat. Herb. 6 : 53"S 6 - J 90i 



