Insecticidal Effects of Extracts from Polygonum orientale L. and Their Action Ways against Mythimna separate Walker Analysis of the Volatile Constituents from Seeds of Polygonum orientale by Gas Chromatography-Mass Spectrometry Coupled with Solid-phase Microextraction HPLC fingerprints of Polygonum hydropiper and its adulterants Anti-inflammatory and analgesic effects of Polygonum orientale extract