600 



•85. P. hydro piper oides Michx. 



Confined mainly to Skokie Stream, in which, at some points 

 (especially west of Braeside and Glencoe), it occurs in great 

 abundance, to the ahnost complete exchision of other species. 



86. P. sagiftatiim L. 



In the outer parts of the swamp meadow ; rare. 



87. P. scandcns L. 



Rare in the marsh proper ; confined mostly to roadside thick- 

 ets. 



Chenopodiaccae 



88. Chcnopodimn album L. 



In open spots of the meadows ; f recpient. 



Ainarantliaceae 



89. Acnida sp. 



Very common along Skokie Stream and in more open spots 

 of the swamp meadow. Material was originally detennined ac- 

 cording to the older manuals as A. tamariscina (Nutt.) Wood. 

 Absence of pistillate plants among my specimens makes it im- 

 possible now to apply positively the more precise nomenclature 

 of Gray's New Manual (see Robinson and Fernald, '08, p. 373) ; 

 but the Skokie IVIarsh plants probably belong to A. tuberculata 

 ]\Ioq. and its variety subnuda Wats. 



90. AinarantJius paniculatus L. 



In open, fairly dn^ spots of the swamp meadow. In 191 2, 

 this species was found only rarely, and it is probable that much 

 of the material considered in 191 1 as A. panicidatus was the up- 

 right form of Acnida sp. 



Caryophyllaceac 



91. Arcnaria lateriflora L. 



About thickets in the meadow and outer swamp meadow ; 

 somewhat frequent. 



92. Stellaria longifolia Muhl. 



Among the grasses and sedges of the swamp meadow; fre- 

 quent. 



93. Ccrasiiuin nutans Raf. 



In a few open, moist, shady spots in the swamp meadow; 

 rather rare. 



