216 INDEX TO AMERICAN BOTANICAL LITERATURE 
Nash, G. V. Hardy woody plants in the New York Botanical Garden. 
18: 246-250, 259-263. N 1917; 18 D 1917; Ig: 11-15. Ja1g918. 
Osterhout, G. E. Concerning some species of Carduus in Colorado. 
Torreya 18: 14-16. 13 F 1918. 
Pammel, L. H. The flora of Lake Vermillion, Minnesota. Amer. 
Forester 5: 40-44. 1917. [Illust.] 
Pammel, L.H The preservation of Iowa’s lakes from the standpoint 
of a botanist. Proc. Iowa Forest & Conserv. Assoc. 1914-1915: 
173 1755. (IGEG: 
Pammel, L. H. The preservation of natural history spots in Iowa. 
Proc. Iowa Forest. & Conserv. Assoc. 1914-1915: 105-108. 1916. 
[Iflust.} 
Pammel, L. H. The vegetation of Iowa lakes. Rep. State Highway 
Com. 163-189. f. 61-79. 1917. 
Pammel, L. H., & King, C. M. The germination and juvenile forms of 
some oaks. Proc. Iowa Acad. Sci. 24: 376-391. f. 58-79. 1917. 
Pammel, L. H., & Kenoyer, L. A. Some notes on pollination of red 
clover. Proc. Iowa Acad. Sci. 24: 357-366. 1917. 
Parker, J. H. Greenhouse experiments on the rust resistance of oat 
varieties. U. S. Dept. Agr. Bull. 629: 1-16. pl. 1-3 +f. 1, 2- 
Pease, A.S. Nuttall and Pickering in the White Mountains. Rhodora 
20: 39. 12F 1018. 
Pool, R. J. A study of the vegetation of the sandhills of Nebraska. 
Minnesota Bot. Stud. 4: 189-312. pl. 26-40 +f. 1-16. 15 Mr 
1914. 
Prizer, J. A. Some experiments in treating citrus trees for gummosis. 
Proc. Fruit Growers. Com. Calif. 45: 218-229. f. 30-36. 1915. 
Ransier, H. E. Fresh pleasures from old fields. Am. Fern Jour. 7: 
99-104. pl. 5, 6. 23 F 1918. 
Reed, G. M. Phytopathological survey of the trees and shrubs of 
Prospect Park and the Botanical Garden (Brooklyn).—Il. Report 
of the second season’s work. Brooklyn Bot. Gard. Record 7: 14- 
24. ja 1988. 
Rohret, M. B. The morphology of the thallus and cupules of Blasia 
pusilla. Proc. lowa Acad. Sci. 24: 429-454. f. 84-87. 1917. 
Rogers, W. E. Notes on Melilotus alba, white sweet clover. Proc. 
Iowa Acad. Sci. 24: 415-428. pl. 13, 14 + f. 81-83. 1917. 
Roig, J. T. The Cuban walnut. (Juglans insularis Griseb.) Mod. 
Cuba Mag. 2: 40-42. Au 1914. 
Safford, W. E. Narcotic plants and stimulants of the ancient Amer- 
icans. Smithsonian Rept. 1916: 387-424. pl. 1-17 +f. 1-6. 1917. 
