Calligonum mongolicum Turcz. had the highest Mg content (1.67%),Ephedra sinica Stapf and Clematis fruticosa Turcz. had the least one(0.11%);

• 镁含量最高的是沙拐枣(1.；67%25)；最低的是麻黄和灌木铁线莲；均为0