Dec. 15, 1914 



Seeds of Agropyron 



281 



Table II. — Diagnostic differences of Agropyron spp. 



LITERATURE CITED 

 (i) Beal, W. J. 



1896. Grasses of North America, v. 2. p. 636-637. New York. 



(2) Britton, N. L., and Brown, Addison. 



1913. Illustrated Flora of the Northern .States, Canada and the British Posses- 

 sions, cd. 2, V. I. p. 2S3, illus. New York. 



(3) Engler, Adolf, and Prantl, K. A. E. 



1887. Die Natiirlichen Planzenfamilien. T. 2, Abt. 2, p. 79, fig. 91. Leipzig. 



(4) Gray, Asa. 



1908. Gray's New Manual of Botany, rearranged and extensively revised by 

 B. L. Robinson and M. L. Fernald. ed. 7, p. 166, fig. 185-189. New 

 York. 



(5) HiLLMAN, F. H. 



191 1. The distinguishing characters of the seeds of quack-grass and of certain 

 wheat-grasses. U. vS. Dept. Agr.. Bur. Plant Indus. Cir. 73, 9 p., 



(6) Pammel, L. H., and King, Charlotte M. 



1910. Results of seed investigations for 1908 and 1909. Iowa Agr. Exp. Sta. 

 Bui. 115, p. 156-175. 



(7) S.^rvis, J. T. 



1913. Suggestions for the identification of the "seeds" of quack grass (..Agro- 

 pyron repens (L.) Beauv.), western wheat grass (AgropyTon smithii 

 Rydb.), and slender wheat grass (.Agropyron tenerum Vaseyl. 5 p. 

 Brookings, S. Dak. 



(8) Stevens, O. A. 



1910. Work done under the seed control act. In loth Bien. Rpt. N. Dak. .Agr. 

 Col., p. 93-118. 



67235°— 14 7 



