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
Scorzonera hispanica Scorzonera hispanica Scorzonera hispanica, black salsify or Spanish salsify, also known as black oyster plant, serpent root, viper's herb, viper's grass or simply scorzonera, is a perennial member of the genus "Scorzonera" in the sunflower family (Asteraceae), cultivated as a root vegetable in the same way as purple salsify ("Tragopogon porrifolius"), also in the sunflower family. The scorzonera sweet is a crystallized dessert made from scorzonera in Évora, Alentejo, Portugal. It is listed on the Ark of Taste. The black salsify plant has heads of yellow ray flowers. The thin black taproot grows up to one meter long and up