INDEX TO AMERICAN BOTANICAL LITERATURE 555 
Hassler, E. Contribuciones 4 la flora del Chaco Argentino-Paraguayo. 
Primera parte: Florula pilcomayensis. i-iii+1-154. Buenos Aires, 
1909. 
Constitutes no. 21 Trab. Mus. Farm. Fac. Cien Méd. Buenos Aires. 
Heald, D., & Wolf, F. A. List of parasitic bacteria and fungi occurring 
in Texas. Trans. Texas Acad. Sci. 11: 10-44. I9QII. ' 
Hedgcock, G. G. The cross-inoculation of fruit trees and shrubs with 
crown-gall. U.S. Dept. Agr. Plant Ind. Bull. 131: 21-23. 16 Mr 
1908. 
Hedgcock, G. G. Field studies of the crown-gall and hairy-root of the 
apple tree. U.S. Dept. Agr. Plant Ind. Bull. 186: 1-108. pl. 1-10. 
17 N 1910. 
Hedgcock, G. G. Field studies of the crown-gall of the grape. 0, S. 
Dept. Agr. Plant Ind. Bull. 183: 1-40. pl. 1-4. 23 JI 1910. 
Hedgcock, G. G. Some stem tumors or knots on apple and quince 
trees. U.S. Dept. Agr. Plant Ind. Circ. 3: 1-16. f. -r0. 11 My 
1908. 
Henslow,G. The origin and history of our garden vegetables and their 
dietetic values—II. Jour. Royal Hort. Soc. 36: 345-357. f. 120- 
125. N 1gto. 
Roots and tubers. 
Heese, E. Echinocactus Gtirkeanus Heese, nov. spec. Monats. 
Kakteenk. 21: 132, 133. 15S 1911. [Illust.] 
Heller, A. A. The North American lupines—IV. Muhlenbergia 7: 
13-15. f. 5. 14 Mr 1g1t. 
Lupinus apodotropis sp. nov. 
Hemenway, A. F. Studies on the phloem of the dicotyledons—I. 
Phloem of the Juglandaceae. Bot. Gaz. §1: 131-135. pl. 13. 16 F 
IOI. 
Hood, S. C., & True, R. H. Camphor cultivation in the United States. 
Yearbook U. S. Dept. Agr. 1910: 449-460. pl. 46-48. 1911. 
Jepson, W. L., Betts, H. S., & Mell, C. D. California tanbark oak. 
U. S. Forest Serv. Bull. 75: 1-34. pl. I-10. 20 S 1911. 
Johnson, D. S. Studies in the development of the Piperaceae—I. 
The suppression and extension of sporogenous tissue in the flower of 
Piper Betel L. var. monoicum C. DC.,: Jour. Exp. Zodlogy 9: 715- 
749. f. I-71. 
Johnson, E. C. Timothy rust in the Unites States. U.S. Dept. Agr. 
Plant Ind. Bull. 224: 1-20. 4 Au I9QII. 
