306 INDEX TO AMERICAN BOTANICAL LITERATURE 
Rigg, G. B. Growth of trees in Sphagnum. Bot. Gaz. 65: 359-362 
15 Ap 1918. 
Rollins, W. Letters from an old to a young gardener. Horticulture 
27: 247-249. f. I-6. 16 Mr 1918. 
Includes notes on corn breeding. 
Sando, C. E., & Bartlett, H. H. The flavones of Rhus. Am. Jour. 
Bot. 5: 112-119. 26 Ap 1918. 
Shafer, J. A. Narrative of a trip to South America for collecting cacti. 
Jour. N. Y. Bot. Gard. 19: 21-43. F 1918. 
Shear, C. L. Pathological aspects of the federal fruit and vegetable 
inspection service. Phytopathology 8: 155-160. 30 Ap 1918. 
Sinnott, E.W. Conservatism and variability in the seedling of Dicoty- 
ledons. Am. Jour. Bot. 5: 120-130. f. r-4. 26 Ap 1918. 
Skan, S. A. Petunia integrifolia. Curt. Bot. Mag. IV. 14: pl. 8749. 
Mr 1918. 
A South American plant. 
Small, J. K. A winter collecting trip in Florida. Jour. N. Y. Bot. 
Gard. 19: 69-77. pl. 210, 211. Ap 1918. 
Small, J. K. Cactus hunting on the coast of South Carolina. Jour. 
N. Y. Bot. Gard. 18: 237-246. pl. 207. N 1917. 
Soth, B. H. Pasque flowers. Am. Bot. 24: 1, 2. F 1918. [Illust.] 
Spessard, E. A. Prothallia of Lycopodium in America. Bot. Gaz. 65: 
362. 15 Ap 1918. : 
Squires, W. A. An interesting case of seasonal inversion. Am. Bot. 
24:.6, 7.8 20%8. 
Stakman, E. C., & Hoerner,G.R. The occurrence of Puccinia graminis 
tritici-compactt in the southern United States. Phytopathology 8: 
141-149. f. ¥, 2. 30 Ap 1918. 
Steil, W. N. Studies of some new cases of apogamy in ferns. Bull. 
Torrey Club 45: 93-108. pl. 4,5. 1 Ap 1918. 
Stevens, F. L. Some meliolicolous parasites and commensals from 
Porto Rico. Bot. Gaz. 65: 227-249. pl. 5,6 +f. 1-5. 15 Mrig18. 
Stevens, H. E. Melanose—II. Florida Agr. Exp. Sta. Bull. 145. 
103-116. f. 26-31. F 1918. 
Stevens, O. A. Plants of Blue Rapids and Mahnattan, Kansas. Cor- 
rections and Index to common names. Am. Mid. Nat. 5: 201-204. 
Mr 1918. 
Stevenson, J. A. Report of the department of pathology and botany. 
Ann. Rep. Ins. Exp. Sta. Porto Rico 1917: 37-83. 1917. 
