Wild Parsnip (pastinaca sativa): This looks like Wild Parsnip. The flowers resemble Queen Anne's Lace except the umbels of flowers are usually yellow. If it is, wear protective gloves and clothing and get rid of it or cut off the flower heads before they re-seed; the sap causes severe skin irritations (blisters or sores) when exposed to sunlight. Suggest you show this photo to a horticulturist at a local garden center for confirmation of its identity.
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wild parsnip (Pastinaca sativa)/ Wild parsnips do not differ appreciably from cultivated ones, except in that they tend to have a less symmetrical form-and this is due entirely to their growing conditions. They also tend to be slightly tougher, slightly sweeter, and slightly more aromatic than their garden counterparts, but this does not significantly affect their use in cooking.