O27. 
528. 
529: 
530: 
531: 
Doz. 
533: 
534. 
Doo 
536. 
Si. 
538. 
529, 
1907. Development of the for- 
est belts in the northwestern part of Clay County, 
Kansas. Trans. Kans. Acad. Sci. 20: 74-79. 
1913. The characteristic plants 
of a typical prairie. Ohio Nat. 13: 65-69 
1926. Observations on the 
grasslands of the central United States. Chio State 
Univ. Studies, Contrib. Bot. Lab. 178: 1-56. 
Schram, Peter (ed.). 1970. Proceedings of a 
symposium on prairie and prairie restoration (20 
papers). Knox College, Galesburg, Ii. 
Sears, P. B. 1942. Forest sequences in the North 
Central States. Bot. Gaz. 103: 751-761. 
Segades-Vianna, F. 1951. A phytosociological and 
ecological study of cattail stands in Oakland 
County, Michigan. J. Ecol. 39: 316-329. 
Shantz, H. L. 1923. The natural vegetation of the 
Great Plains region. Ann. Assoc. Amer. Geo- 
graphers 13: 81-107 (selected portions). 
Sharp, Ward M. 1953. A re-evaluation of plant 
communities within the Pheasant Range in the 
Nebraska Sandhills. Ecology 34: 771-777. 
Shay, C. T. 1967. Vegetation history of the south- 
ern Lake Agassiz basin during the past 12,000 
years, p. 231-252. In .W.J. Mayer Oakes (ed.). 
Life, land, and water. Proc. 1966 conference on 
environmental studies of the glacial Lake Agassiz 
region. Univ. Manitoba Press, Winnepeg. 
Shelford, V. E., and G. S. Winterringer. 1959. The 
disappearance of an area of prairie in the Cook 
County, Illinois Forest Preserve District. Amer. 
Midl. Nat. 61: 89-95. 
Sheppeard, J. H. 1919. Carrying capacity of native 
grasses in North Dakota. J. Amer. Soc. Agron. 11: 
129-142. 
Sherff, E.E. 1912. The vegetation of Skokie 
Marsh, with special reference to subterranean 
organs and their interrelationships. Bot. Gaz. 53: 
-415-435. 
Shimek, B. 1910. Prairie openings in the forest. 
Proc. Iowa Acad. Sci. 10: 16-19. 
Pips 
540. 
541. 
542. 
543. 
544. 
545. 
546. 
547. 
548. 
549. 
550. 
SOL. 
San 
553: 
ee DI he praittess Univ-clowa 
Nat. Hist. Lab. Bull. 6: 169-240. 
a 191 hes planteceographyaon 
the Lake Okoboji region. Univ. lowa Nat. Hist., 
Lab. Bull. 7(2): 3-69. 
aS Ra od GOS 1917. The sand flora of Iowa. 
Univ. Iowa Lab. Nat. Hist. Lab. Bull. 7: 4-24. 
1924. The prairie of the 
Mississippi River bluffs. Proc. lowa Acad. Sci. 31: 
205-215. 
=| 19254. Papers, con athespraines 
Univ. lowa Studies Nat. Hist. 11. 36 p. 
1925b. The persistence of the 
prairie. Univ. lowa Studies Nat. Hist. 11(5): 3-24. 
1931. The relation between the 
migrant and native flora of. the prairie region. 
Univ. Iowa Studies Nat. Hist. 14: 10-16. 
—  -Ct—é«~*L'O'. ‘The’. plant GOSH Oke 
Iowa (edited by H. S. Conard). Univ. Iowa Studies 
Nat. Hist. 18(4): 1-178. 
Shirley, Hardy L. 1934. Observations on drought 
injury in Minnesota forests. Ecology 15: 42-48. 
1945. Reproduction of upland 
conifers in the Lake States as affected by root 
competition and light. Amer. Midl. Nat. 33: 
537-612. 
Shively, S. B., and J. E. Weaver..1939. Amount of 
underground plant material in different grassland 
climates. Univ. Nebr. Cons. and Survey Div. Bull. 
21. 68 p. 
Short, C. W. 1845. Observations on the botany of 
Illinois, more especially in reference to the autum- 
nal flora of the prairies. West. J. Med. and Surg., 
N.S. 3: 185-198. 
Smith, B. E., and G. Cottam. 1967. Spatial rela- 
tionships” of mesic forest herbs in southern 
Wisconsin. Ecology 48: 546-558. 
Smith, C. Ray. 1963. Variations in vegetation and 
soil on three breaks—sites overlying three different 
limestone formations. M.S. Thesis. Ft. Hays, Kans., 
State Col. 
