Root plant to fuel the process. In return, the plant takes nitrogen compounds produced from ammonia by the bacteria. The term root crops refers to any edible underground plant structure, but many root crops are actually stems, such as potato tubers. Edible roots include cassava, sweet potato, beet, carrot, rutabaga, turnip, parsnip, radish, yam and horseradish. Spices obtained from roots include sassafras, angelica, sarsaparilla and licorice. Sugar beet is an important source of sugar. Yam roots are a source of estrogen compounds used in birth control pills. The fish poison and insecticide rotenone is obtained from roots of "Lonchocarpus" spp. Important
Eutrochium purpureum the stems and foliage, but many more have been proposed in the past, thought most authorities now accept that this is a variable species and population variations integrate. "Eutrochium purpureum" is sometimes cultivated and has escaped from cultivation in parts of New Zealand. Eutrochium purpureum Eutrochium purpureum, commonly known as purple Joe-Pye weed, kidney-root, sweetscented joe pye weed, sweet Joe-Pye weed, gravel root, or trumpet weed is an herbaceous perennial plant in the sunflower family. It is native to eastern and central North America, from Ontario east to New Hampshire and south as far as Florida, Louisiana, and Oklahoma. "Eutrochium