水冬瓜是山桐子及其变种毛叶山桐子的通称,为大风子科的落叶乔木,高可达10～16米。广泛分布于长江、淮河以南各省。我省主要分布于秦岭南坡及巴山,以宁强县较多。当地群众虽早有采种榨油食用的习惯,但这一树种仍处于野生状态,至五十年代末期,才开始作为木本油料树种加以驯化栽培。1961年,我们从宁强县取来种子,在长安县南五台地区播种育苗,获得成功。定植在平地和山地的林木都生长良好,1966年结实,子代林木同样生长良好。现将引种栽培结果总结于后。一、引种点的自然环境 Water melon is the generic term for the tree jatropha curcas and its variant mulberry curcumol, which is a deciduous tree of the Galeriaceae, with a height of 10 to 16 meters. Widely distributed in the Yangtze River, south of the Huaihe provinces. Our province is mainly located in the southern slope of Qinling Mountains and Bashan, Ningqiang County more. Although the local people have long had the habit of planting oil for consumption, the species is still in a wild state and it was not until the late 1950s that it began to be domestically cultivated as a woody oilseed species. In 1961, we took seeds from Ningqiang County and sowed nurseries in the south Wutai of Chang’an County for success. The trees planted in the plains and the mountains grew well and were strong in 1966, and the offspring also grew well. Now introduction of cultivation results summarized later. First, the introduction of the natural environment