INDEX TO AMERICAN BOTANICAL LITERATURE 159 
Hansen, A. A. A woodland plant that is becoming a grainfield 
weed. Torreya 23: 85, 86. O 1923. 
Phacelia Purshii, 
Hansen, H.R. Severity of attacks of black stem-rust in Den- 
mark, 1884-1921. Phytopathology 13: 404-407. 18S 
1923. 
Harter, L. L. & Jones, L. R. Cabbage diseases. U.S. Dept. 
Agr. Farm. Bull. 1351: 1-28. f. 7-14. S 1923. 
Harvey, R. B. Elias Judah Durand. Phytopathology 13: 408, 
409. pl. 18. 18 S 1923. 
Hoagland, D. R. The absorption of ions by plants. Soil Sci. 
16: 238-246. f. 7, 2. 0). 1008. 
Hoagland, D. R. & Davis, A. R. Further experiments on the 
absorption of ions by plants, including observations on the 
effect of light. Jour. Gen. Physiol. 6: 47-62. 205 1923. 
Hollick, A. Erect silky leather flower on Staten Island [New 
York]. Proc. Stat. Isl. Inst. Arts & Sci. 1: 120-122. 130 
1923. 
Viorna ochroleuca (Aiton) Small. 
Holm, T. Chelone glabra L. A morphological study. Am. 
Jour. Sci. 206: 265-270. f. 1-5. S 1923. 
Holzinger, J. M. Desmatodon arenaceus Sull. redivivus. Bry- 
ologist 26: 48,49. 300 1923. 
Holzinger, J. M. Unusual provision for vegetative reproduction 
in Syrrhopodon parasiticus. Bryologist 26:47. 300 1923. 
[Lllust.] 
Howe, M.A. Dahlias and their cuiture. Jour. New York Bot: 
Gard. 24: 169-187. S 1923. [Illust.| 
Hungerford, C. W. A serious disease of wheat caused by Scle- 
rotium rhizodes in Idaho. Phytopathology 13: 463, 464. 
19 O 1923. 
Hungerford, C. W. Specialized varieties of Puccinia glumarum, 
and hosts for variety Tritici. Jour. Agr. Research 25: 363- 
402. pl. 1-6. 15S 1923. 
