220 INDEX TO AMERICAN BOTANICAL LITERATURE 
Rhoads, A.S. Notes on the failure of grapevines to set fruit and 
in shelling. Phytopathology 13: 513-519. pl. 21. 26 D 
1923. 
Richey, F.D. Defective seeds in maize—an ancient character. 
Jour. Hered. 14: 359, 360. f. r2. 17 D 1923. 
Robbins, W. J.,& Maneval, W. E. Further experiments on 
growth of excised root tips under sterile conditions. Bot. 
Gaz. 76: 274-287. f. 1-3. 10 D 1923. 
Rogers, W. E. Resistance of trees to ice-storm injury. Tor- 
reya 23: 95-99. D 1923. [lIllust.] 
Rose, J. N. Dudleya arizonica. Addisonia 8: 35. pl. 274. 10 
N_ 1923. 
Rose, J. N. Hamaitocactus setispinus. Addisonia 8: 45, 46. 
pl. 279. 10 N 1923. 
Rydberg, P. A. Genera of North American Fabaceae. I. 
Tribe Galegeae. Am. Jour. Bot. 10: 485-498. pl. 33-35. 
27 N 1923 
Includes Daubentontopsis, gen. nov. 
Rydberg, P. A. Rosa palustris. Addisonia 8: 37, 38. pl. 275. 
10 
Schallert, P. O. Notes on a new rose-flowered Robinia from 
South Carolina. Torreya 23: 104, 105. D 1923. 
Robinia Ashei, sp. nov. 
Schmitz, H. Leafcast of Larix occidentalis by Hypodermella 
Laricis Tubeuf. Phytopathology 13: 505, 506. f. 7. 9 N 
1923. 
Schneider, C. Notes on hybrid Berberis and some garden forms. 
Jour. Arnold Arb. 4: 193-232. 19 N 1923. 
Schrader, F. The origin of the mycetocytes in Pseudococcus. 
Biol. Bull. 45: 279-302. pl. 1-3. D 1923 
Treats of the parasitism of Fungi in a Homopterous insect. 
Seifriz, W. Reaction of protoplasm to salts and antagonistic 
action of salts and alcohol. Bot. Gaz. 76: 389-402. 28 D 
1923. 
