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火炬树为漆树科漆树属植物,灌木或小乔木,高10-12米,原产北美洲,广泛分布在加拿大的东南部和美国中部,欧洲引种后在各地也有分布。1959年及1963年北京植物园先后由国外不同地区引进,造林10多年来生长良好,经过1972和1973两个大旱年份的考验,仍枝叶繁茂,花实不衰,根蘖苗丛生,郁闭很好。火炬树皮为黑褐色,稍具不规则纵裂。枝条有灰色茸毛。叶互生,奇数羽状复叶,小叶11-23枚,长圆至披针形,长5-12厘米,先端渐尖,边缘具锯齿,基部圆形或楔形,背面苍白,均有茸毛,老后脱落。雌雄异株,花序
Rhus typhina Camellia genus, shrubs or small trees, 10-12 meters high, native to North America, widely distributed in southeastern Canada and central United States, Europe after the introduction is also distributed in various places. In 1959 and 1963, Beijing Botanical Garden was introduced from different regions in succession. The afforestation grew well in the past 10 years. After two years of drought in 1972 and 1973, the botanical garden still flourished, it is good. Torch bark is dark brown, slightly irregular longitudinal split. Branches have gray hair. Leaves alternate, odd pinnate, leaflets 11-23, oblong to lanceolate, 5-12 cm long, apex acuminate, margin serrate, base rounded or cuneate, pale on back, both hair, old Off. Dioecious, inflorescences