Ключевые слова: agriculture, alternative, background, bean, beans, biodiesel, botany, castor, castor bean, close, closeup, eco, energy, environment, euphorbiaceae, farm, foliage, fruit, fuel, green, industrial, leaves, natural, nature, oil, oilseed, plant, purgative, ricin, ricine, ricinus, rural, seed, tree, tropical, vegetation,