caucasian heracleum flowering, giant hogweed, dangerous powerful invasive plant that causes phytophotodermatitis

apiaceae caucasus heracleum mantegazzianum biology blooming botany caution contact dangerous ecology fight flower giant hogweed sosnovski inflorescence invasive leaves monocarpic perennial noxious weed phototoxic phytophotodermatitis plant plants public health safety silage species spread sun vegetation white herbaceous carrot family cartwheel-flower cow parsley caucasian sosnowskyi humans blisters scars powerful heracleuming flowering flora vegatation close