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Wild Turnip (Brassica rapa [syn. Brassica rapa subsp. sylvestris]), although this weed is the same species as the turnip usually grown as a winter feed for livestock, which eat both the foliage and the swollen beet-like roots, within a couple of generations of being left to grow wild from seed the root size has reduced to around golf ball size. Order: Brassicales, Family: Brassicaceae