114 



HORDEAE 



Agropyron 



50 



Map 173 



Agropyron repens (L.) Beauv. 



Miles 

 50 



Map 174 



Agropyron Smithii Rydb. 



"^5 

 Map 175 



Agropyron pauciflorum (Schwem.) Hitchc. 



1. Agropyron repens (L.) Beauv. Quackgrass. Map 173. This 

 species has become well established in the northern two thirds of the state, 

 especially along roadsides and railroads where there is no effort to extermi- 

 nate it. It is most abundant in the lake area where it sometimes covers 

 acres of cultivated fields and pastures. Most of the landowners have de- 

 spaired of exterminating it and merely use control measures. It is now 

 known that it can be eradicated by the use of chemicals, and every land- 

 owner should proceed without delay to exterminate it. 



The extreme variability of this species has caused some confusion in its 

 recognition. It has been decided to treat the varied forms as a species 

 complex. Those who wish to divide the forms should see Fernald on the 

 American variations of Agropyron repens in Rhodora 35 : 182-185. 1933. 



Nat. of Eurasia; Newf. to Alaska, southw. to N. C, Ark., and Calif. 



2. Agropyron Smithii Rydb. Bluestem Wheatgrass. Map 174. All 

 of my specimens were found along railroads, where the colonies will doubt- 

 less persist and spread. Apparently it does not propagate as vigorously as 

 the preceding species, but, when discovered, it should be eradicated. This 

 is a western species that has been introduced eastward of Iowa and Kansas. 



N. Y., Mich, to Alberta and Wash., southw. to Ohio, Kans., Tex., Ariz., 

 and Calif. 



3. Agropyron pauciflorum (Schwein.) Hitchc. {Agropyron tenerum 

 Vasey of Gray, Man., ed. 7, Britton and Brown, Illus. Flora, ed. 2, and 

 Agropyron caninum var. tenerum (Vasey) Pease & Moore of Deam, 

 Grasses of Ind.) Slender Wheatgrass. Map. 175. Very local. Found 

 in both dry and moist habitats in a few of our northern counties. 



Lab. to Alaska, southw. to the mts. of W. Va., Mo., N. Mex., Calif., and 

 nw. Mex. 



4. Agropyron subsecundum (Link) Hitchc. (Agropyron caninum f. 

 pubescens (Scribn. & Smith) Pease & Moore and Agropyron trachycaulum 

 (Link) Malte.) Bearded Wheatgrass. Map 176. This species is local in 



