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Piptochaetium avenaceum ARS. en Piptochaetium avenaceum Parodi blackseed speargrass usda gov imageID stavahp tif USDANRCS PLANTS Database Piptochaetium avenaceum Parodi Tracey Slotta Provided by ARS Systematic Botany and Mycology Laboratory United States MD Great Falls PDUSGov Uploaded with Piptochaetium avenaceum