100° INDEX TO AMERICAN BOTANICAL LITERATURE 
Gleason, H. A. The Jris collection at the New York Botanical Garden. 
Flower Grower 8: 10, 11. Ja 1921. 
Grant, C. V., & Hansen, A. A. Poison ivy and poison sumac and their 
eradication. U.S. Dept. Agr. Farmers’ Bull. 1166: 3-16. f. 1-6. 
O 1920. : 
Grier, N. M. Light correlated variations of the sterile stem of Equi- 
setum sylvaticum. Rhodora 22: 165-167. 7 D 1920. 
Haining, H. I. Development of embryo of Gnetum. Bot. Gaz. 70: 
436-445. pl. 30-47 + f. 1: 30 D 1920. 
Hansen, A. A. Chicory control and eradication. U. S. Dept. Agr. 
Carc.. 103: 2-4. f. r. 8 1020: 
Hansen, A. A. The hawkweeds or paintbrushes. U. S. Dept. Agr. 
Cire. 3306 s72f. 7°20 -O 1990: 
Hardy, M. E. Christmas roses. Am. Bot. 26: 125-127. N 1920. 
Harland, S. C. Inheritance of certain characters in the cowpea- 
Jour. Genetics 10: 193-205. O 1920. ; 
Harland, S.C. Inheritance in Dolichos Lablab, L. Part I. Jour. Gene- 
tics 10: 219-226. O 1920. 
Harland, S. C. Inheritance in Ricinus communis, L. Part I. Jour. 
Genetics 10: 207-218. O 1920. 
Harper, R. M. The limestone prairies of Wilcox County, Alabama. 
Ecology 1: 198-203. f. 1, 2. Jl 1920. 
Harper, R. M. Some relations between soil, climate, and civilization 
in the southern Red Hills of Alabama. So. Atl. Quarterly 19: 
201-215. Jl 1920. 
Henry, J. K. Ribes divaricatum X Ribes Lobbii. Can. Field ‘Natur. 
33:94. N 1919. 
‘Holm, T. A morphological study of Cicer arietinum. Bot. Gaz. 
70: 446-452. pl. 42-44. 30 D 1920. 
Holm, T. Types of Canadian Carices. Can. Field Natur. 33: 72777: 
O 1919. 
Hotson, J. W. Colear-rot of apple trees in the Yakima Valley [Wash- 
ington]. Phytopathology 10: 465-486. f. 1-15. 23 N 1920. 
Howe, M. A. Tertiary calcareous algae from the islands of St. Bar- 
tholomew, Antigua, and Anguilla. Carnegie Inst. Washington, 
Publ. 291: 9-19. pl. 1-6. 17 O 1919. 
Includes iptions of four new species, Archaeolithothamnum affine, Litho- 
thamnium concretum, Lithophyllum homogeneum, and Lithophyllum (?) molare, and 
