Study on Chromosome Character of Sonchus arvensis L. Influences of Drought Stress on Antioxidative Activity and Osmoregulation Substance of Sonchus brachyotus DC. A New Species of Sonchus from China Studies on Flavonol Glycosides of Sonchus arvensis L. Physiological response of Sonchus brachyotus to salt stress A New Qua lityW ild Vegetable Var iety ‘Shennong End ive 1’ Lipid-soluble Chemical Constituents in Sonchus oleraceus Studies on Chemical Constituents of Sonchus arvensis L. A New Qua lityW ild Vegetable Var iety ‘Shennong End ive 1’ Accumulation Characteristics of Two Ecotypes Sonchus asper (L.) Hill. To Cd