蕨类植物和裸子植物没有导管，麻黄类（Ephedrales）中隔壁的具缘纹孔贯穿成为导管，伏地卷柏（Selaginella nipponica）、蕨（Pt-eridium aquilinum）中梯纹纹孔贯穿成为导管。
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目的用反相高效液相色谱梯度洗脱法测定麻黄及其复方制剂中麻黄类生物碱的含量。
Objective To determine simultaneously the contents of ephedrine and pseudoephedrine in ephedra herb and its compound preparations by high-performance liquid chromatography.
中国奥运官员已建议中国运动员不要服用传统中药，因为某些中药含有违禁的兴奋剂类物质，如麻黄。
Chinese Olympic officials have advised national athletes not to take traditional remedies because some contain banned substances such as herbal ephedrine, a stimulant.
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