INDEX TO AMERICAN BOTANICAL LITERATURE 313 
Harms, H. Eine neue Cucurbitacee aus Peru. Notizbl. Bot. Gart. 
und Mus. Berlin-Dahlem 7: 502. 1 Mr 1921. 
Gurania Weberbaueri sp. nov. 
Harms, H. Eine neue Gattung des Leguminosae-Caesalpinioideae aus 
Argentina. Notizbl. Bot. Gart. und Mus. Berlin-Dahlem 7: 500, 
501. 1 Mr 1921. 
Stenodrepanum gen. nov. 
Harms, H. Einige neue Phaseolus-Arten. Notizbl. Bot. Gart. und 
Mus. Berlin-Dahlem 7: 503-508. 1 Mr 1921. 
New species from Peru (4), Brazil (2), and Mexico (2). 
Harper, R. M. Geography of central Florida. Ann. Rep. Florida 
Geol. Surv. 13: 71-307. f. 1-43. Ap 1921. 
Harris, J. A., & Sinnott, E. W. The vascular anatomy of normal and 
variant seedlings of Phaseolus vulgaris. Proc. Nat. Acad. Sci. 
7:35-41. Diagr: 1-4. 15 Ja 1921. 
Harshberger, J. W. The artistic anatomy of trees. Public Lect. 
Univ. Pennsylvania Faculty 7: 419-441. 1920. 
Harshberger, J. W. Slope exposure and the distribution of plants in 
eastern Pennsylvania. Bull. Geogr. Soc. Philadelphia 17: 17-25. 
f. 1-4. Ap 1921. 
Hastings, G. T. Succession of algae in the Grassy Sprain Reservoir 
[Yonkers, N. Y.]. Jour. New York Bot. Gard. 22: 64-66. Mr 
1921. 
Hildebrandt, F. M. A physiological study of the climatic conditions 
of Maryland, as measured by plant growth. Physiol. Researches 
2: 341-405. f. 1-8 My 1921. 
Hill, J.B. The rate of development of the cones of the Norway Spruce. 
Am. For. 27: 256. Ap 1921. 
[Hitchcock, A. S]. Botanical exploration in British Guiana [1919, 
1920]. Smithson. Misc. Coll. 72°: 54-58. f. 67-71. 1921. 
Hitchcock, A. S. Report of the committee on nomenclature of the 
Botanical Society of America. Science II. 53: 312-314. I Ap 1921. 
Hitchcock, A. S. The type concept in systematic botany. Am. 
Jour. Bot. 8: 251-255. 24 My 192!. 
Hoehne, F. C. Monographia das Asclepiadaceas Brasileiras. Oxy- 
petalum, R. Br. Comm. Linhas Teleg. Estrat. de Matto-Grosso ao 
Amazonas Publ. 38!: 1-131. pl. 1-59. Au 1916; Addenda I: 1-13. 
pl. 60, 6r. Au 1916. 
Includes 2 new species. 
