82 



Rhodora 



[May 



shown no signs of becoming permanent. The Helenium has not 

 been found near the waste-heap, and may have been introduced in 

 grass seed ; but I have incHned to the wool theory, because the 

 plants were all found along the line of the principal current when the 

 river is high enough to overflow the intervales below the mill. 



Taken as a whole, the list does not present many plants of a 

 character, in this latitude, to worry the farmer with the fear of new 

 weeds. 



For the identification of the majority of the species, I am indebted 

 to Merritt L. Fernald. Thanks are also due Dr. B. L. Robinson, 

 Dr. J. M. Greenman and Prof. F. Lamson Scribner, for their kind 

 assistance in the work of identification. 



Plants introduced in wool-waste at North Berwick., Me. 



Senebiera pinnatifida, DC. 



Erodium cicutarmm, L'Hdr. 



E. moschatum, Willd. 



E. Botrys, Bertolini. 



Medicago lupjilina^ L. 



M. arabica^ All. {M. maculata, 



Willd.). 

 M. hispida, Gaertn. {M. denticulata, 



Willd.). 

 M. laciniata. All. 

 Glycyrrhizalepidota, Nutt. 

 AplopappHS gracilis. Gray. 

 Artemisia annua, L. 

 A. Ludoviciana, Nutt. 

 Aster frondosus, Torr. & Gray. 

 Bidens aristosa, Britton {Coreopsis, 



Michx.). 

 Cosmos pa ri'ijlorus, H B K . 

 Cotula australis, Hook. f. 

 Dysodia chrysanthemoides, Lag. 

 Heleniiittu iiudiJlorH»t, Nutt. 

 Heterospermum pinnatum, Cav. 

 Hy»ieiiatherum aureum. Gray. 

 Madia glomerata, Hook. 

 Verbesina encelioides, B. & H. 

 Xanthiuni Canadense, Mill. 

 X. spinosum, L. 

 X. struinarium, L. 

 Echinospermiim Lappitla, Lehm. 

 E. Redowskii, Lehm., var. occiden- 



tale, Wats. 



Veronica peregrina, L. 



Marrnbium 7'ulgare, L. 



Amaranthus retrojlexus, L. 



A. hybridus, L. 



A. graecizans, L. (A. albus, L.). 



A triplex patulum, L., var. littorale. 



Gray. 

 Atriplex patulum, L., var. hastatum. 



Gray. 

 Chenopoditim leptophyllum, Nutt. 

 C. olidum, Watson. 

 C. album, L., var. viride, Moq. 

 Monolepis chenopodioides, Moq. 

 M. trijida, Schrad. 

 Cenchrus tribuloides, L. 

 Tragus racemosus, Hall. 

 Sporobolus interruptus, Vasey. 

 S. cryptandrus, Gray. 

 S. cryptandrus. Gray, var. strictus, 



Scribn. 

 Folypogon Monspeliensis, Desf. 

 Deschampsia elongata, Munro. 

 Chloris cucullata, Bisch. 

 C. elegans, HBK. 

 Lycurus phleoides, HBK. 

 Bouteloua Humboldtiana, Griseb. 

 B. pros t rata, Lag. 

 B. oligostachya, Torr. 

 B. unijiora, Vasey. 

 Eragrostis major, Host. 

 E. Neo-mexicanus, Vasey. 



