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Study on sequence characterized amplified region (SCAR) markers of Polygonum capitatum The Theory of Similarity Between Close Relative Species of ToxicMedicinal Herbs in Toxicity and Poisoning Action Micro-morphological Characteristics of Leaf Epdermis for Ilex kudingcha and Its Relative Species and Their Taxonomical Significance Response of Polygonum viviparum Species and Community Level to Long-term Livestock Grazing in Alpine Shrub Meadow in Qinghai-Tibet Plateau