一、前言泡桐是玄参科,泡桐属,前人已发表过名称的有20个种和变种,以后有人合并为6个种,近年林业科研单位的调查研究认为我国有8个种和4个变种。它是我国生长最快的树种之一。据调查兰考泡桐、毛泡桐、天水泡桐是天水市、县优良速生树种之冠(泡桐属的其它品种今年引进试验)。桐材在国际市场列为贵重材种之一,价 I. Introduction Paulownia is Scrophulariaceae, Paulownia, predecessors have published names of 20 species and variants, later merged into six species in recent years, forestry research institutes that the study of 8 species and 4 variant. It is one of the fastest growing species in our country. According to the survey Lancao Paulownia, Paulownia, Paulownia is Tianshui City, county crown of the fastest growing species (other varieties of Paulownia introduction of this year’s test). Tong material in the international market as one of the valuable timber, price