. Bulletin of the Department of Agriculture. Agriculture; Agriculture. o^^^^1^J^. BULLETIN No. 772 Contribution from the Bureau of Plant Industry WM. A. TAYLOR, Chief. Washington, D. C. PROFESSIONAL PAPER March 20, 1920 THE GENERA OF GRASSES OF THE UNITED STATES, WITH SPECIAL REFERENCE TO THE ECONOMIC SPECIES. By A. S. Hitchcock, Systematic Agrostologist. CONTENTS. Page. Scope and plan of the -work 1 Poaceae, the grass family 5 Descriptions of the subfamilies and keys to the tribes 6 Descriptions of the tribes and keys to the genera 8 Descriptions of the genera 22 1. Bamboseae, the bamboo
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. o^^^^1^J^. BULLETIN No. 772 Contribution from the Bureau of Plant Industry WM. A. TAYLOR, Chief. Washington, D. C. PROFESSIONAL PAPER March 20, 1920 THE GENERA OF GRASSES OF THE UNITED STATES, WITH SPECIAL REFERENCE TO THE ECONOMIC SPECIES. By A. S. Hitchcock, Systematic Agrostologist. CONTENTS. Page. Scope and plan of the -work 1 Poaceae, the grass family 5 Descriptions of the subfamilies and keys to the tribes 6 Descriptions of the tribes and keys to the genera 8 Descriptions of the genera 22 1. Bamboseae, the bamboo tribe 22 2. Festuceae, the fescue tribe 24 3. Hordeae, the barley tribe 87 4. Aveneae, the oat tribe 106 5 Agrostideae, the timothy tribe 121 Descriptions of the genera—Continued. 6. Nazieae, the curly-mesquite tribe 165 7. Chlorideae, the grama tribe 171 S. Phalarideae, the canary-grass tribe ... 199^ 9. Oryzeae, the rice tribe 204 10. Zizanieae, the Indian-rice tribe 206 11. Melinideae, the molasses-grass tribe .. 212 12. Paniceae, the millet tribe 21S 13. Andropogoneae, the sorghum 14. Tripsaceae, the corn tribe 280 List of new species and new names 288 Index 289 SCOPE AND PLAN OF THE WORK. The present bulletin describes all the genera of grasses that include species that are native, have been introduced, or are cultivated in the L'nited States. Under each genus are given the species that are of economic importance, either as useful or harmful grasses. Of all grasses the grains are of the greatest importance. Chief among other useful grasses are those that arc cultivated for meadow or pasture and those indigenous species which furnish forage upon the native pasture or ranges. Other important grasses are the sugar-producing species, those used in broom or paper making, and the ornamental species. It is intended to give under each genus the botanical information concerning all our grasses tluit are conspicuous enough to have at- tracted the attention of agricu
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