@article {7826, title = {Echinochloa microstachya subsp. microstachya (Poaceae) _ a new casual plant in the Polish flora. Fragm. Flor}, journal = {Geobot., suppl}, volume = {7}, year = {1999}, month = {1999///}, pages = {165 - 177}, author = {A. Pacyna} } @article {7827, title = {What is Cenchrus tribuloides (Poaceae) which appears on the Polish list of quarantine plants? Fragm. Flor}, journal = {Geobot., suppl}, volume = {7}, year = {1999}, month = {1999///}, pages = {73 - 78}, author = {J. Guzik and A. Pacyna} } @article {7819, title = {Echinochloa esculenta (Poaceae) _ a new alien plant in Poland. Fragm. Flor}, journal = {Geobot}, volume = {42}, year = {1997}, month = {1997///}, pages = {265 - 273}, author = {A. Pacyna and J. Guzik} }