green poisonous leaves hogweed heracleum sosnowskyi in nature

aggressive allergen background beautiful botany burn burns cancerous close common congenital contain danger dangerous deformities europe feed field flora floral flowering furanocoumarins garden giant grass green growing heracleum herb hogweed intense invasive large leaf leaves livestock monocarpic natural nature outdoor parsnip parts perennial photosensitizing phytotodermatitis plant poison poisonous road roadside silage skin sosnowski sosnowskyi substances summer terrible toxic tumors weed weedall weeds white wild wildflower