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Analysis of the effect of topographical conditions on the artemisinin content in sweet wormwood herb in Guangxi, China The Seasonal Dynamic of the Agronomic Traits and the Content of Alkaloid of the Cultivated Catharanthus roseus Plant architecture characteristics of Haloxylon ammodendron and Haloxylon persicum in Zhungar Basin Biological Characteristics of Artificial Planting 1-Year-Old Saussurea involucrate in Low Altitude Region