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湿地松(Pinus e11iottii),火炬松(P taeda)原产于美国东南沿海,二十年代引入我国,随后在长江流域十多个省区进行引种试验.现已向北引至陕西汉中(北纬33°04′),河南开封(34°47′),山东平邑(35°50′)等地.经过多年的试验,已证明
Pinus elliottii and Pinus taeda native to the southeast coast of the United States and introduced to China in the 1920s, and then introduced in more than 10 provinces and autonomous regions in the Yangtze River basin, now leading northward to Hanzhong, Shaanxi Province (latitude 33 ° 04 ’), Kaifeng in Henan Province (34 ° 47’), Pingyi (35 ° 50 ’) in Shandong Province, etc. After years of experiments,