. Bulletin of the Department of Agriculture. Agriculture; Agriculture. UNITED STATES DEPARTMENT OF AGRICULTURE BULLETIN No. 772 Contribntion 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 Scop« 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. Barab
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. UNITED STATES DEPARTMENT OF AGRICULTURE BULLETIN No. 772 Contribntion 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 Scop« 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. Baraboseae, the Bamboa Tribe . 22 2. Festuceae, the Fescue Tribe ... 24 3. Hordeae, the Barley Tribe .... 87 4. Aveneae, the Oat Tribe 106 6. Agrostideae, the Timothy Tribe . 121 6. Nazieae, the Curly-Mesquite Tribe . 165 Paeg Descriptions of the Genera—Continued. 7. Chlorideae, the Grama Tribe . .171 8. Phalarideae, the Canary-Grass Tribe 139 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 . . .213 13. Andropogoneae, the Sorghum Tribe 252 14. Tripsaceae, the Com 280 List of New Species and New Names . .288 Index 289. WASHINGTON 60VEBNMENT PRINTING OFFICB 1920. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Dept. of Agriculture. [Washington, D. C. ?] : The Dept. : Supt. of Docs. , G. P. O.
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