inflorescence of heracleum sosnowskyi, heracleum mantegazzianum, sosnowsky`s hogweed, invasive plant

apiaceae baltic belarus biology blooming botany carrot caucasus caution common contact contain dangerous ecology family fight flower flowering furanocoumarins giant health heracleum herbaceous hogweed inflorescence invasive leaves mantegazzianum monocarpic noxious perennial phototoxic phytophotodermatitis plant plants poland public russia safety silage sosnovski sosnowskyi sosnowskys species spread states sun ukraine weed white