POACEAE 149 



3. A. caninum (L.) R. & S. In fields, etc.: N. B. to the Yukon, 

 south to N. Car., Tenn., Iowa and Colo. Also in Eu. and Asia. 

 Conn. Occasional. 

 N. Y. Cairo, Greene Co. 

 N. J. Morris Co. 

 Pa. Pike and Monroe counties. 

 Agropyron lenerum Vasey has been collected as a waif in Conn. 



75. Hordeum [Tourn.] L. 



Flowering scales, exclusive of awns, 6-8 mm. long. I. H. jubatum. 



Flowering scales, exclusive of awns, about 12 mm. long. 2. II. murinum. 



1. H. jubatum L. In dry soil: Ont. to Alask., south to 111., Tex. 



and Cal. Naturalized in the east from Lab. to N. J. and Pa. 

 A rare and scattered weedy grass, with us. 



2. H. murinum L. On ballast and in waste places: Mass. to 



D. C. Adventive from Europe. 



Rare as a ballast weed in most parts of the area. 



The barley, Hordeum vulgare L. occasionally escapes in the range, and H. nodosum 

 L. has been collected as a waif in Bucks Co., Pa. H. pusillum Nutt. is reported as 

 introduced at Aqueduct, L. I., by E. P. Bicknell. 



76. Elymus L. 



Empty scales linear lanceolate to linear. 



Empty scales manifestly indurated, usually curved or bowed 

 at the white base. 

 Awn rarely exceeding I },4 times length of flowering scale. 

 Flowering scales glabrous or hispidulous. 



Spike long exserted. I. E. halophilus. 



Spike included in the broad, inflated upper 



sheath. 2. E. virginicus. 



Flowering scales hirsute. 3. E. hirsutiglumis. 



Awn exceeding twice length of flowering scale. 4. E. glabriflorus. 



Empty scales not indurated, not white at the base, straight. 5. E. canadensis. 

 Empty scales narrowly subulate. 



Spikelets hirsute. 6. E. striatus. 



Spikelets glabrous or hispidulous. 7. E. arkansanus. 



1. E. halophilus Bicknell. Salt marshes: Mass. to N. J. 



Conn. " Along the Sound " (E. P. Bicknell). 

 N. Y. Common along the coast of L. I. and S. I., unknown else- 

 where. 

 N. J. Common from Sandy Hook to Cape May. 



2. E. virginicus L. In moist soil, especially along streams: N. S. 



to Man., south to Fla. and Tex. 



