高效益的经济作物──甜叶菊甜叶菊是一种多年生的菊科草本植物，原产在南美洲巴拉圭的北部高原，当地农民已有几百年的种植历史。目前世界各地都有广泛种植，我国截止１９８１年就有１６个省、市、自治区引种试种，黑龙江省五常市及国营海林农场等地现已形成大规模种植生... Highly Efficient Cash Crop ─ ─ Stevia Stevia is a perennial Asteraceae herb native to the northern plateau of Paraguay in South America. Local farmers have been cultivating for centuries. At present, planting is widely spread all over the world. As of 1981, 16 provinces, municipalities and autonomous regions in China have introduced and planted seeds, and the five permanent stock market and state-owned Hailin Farm in Heilongjiang Province have now formed large-scale planting students.