火炬树(Rhus typhina L.)为漆树科漆树属植物,灌木或小乔木,高达10—12米。树皮黑褐色,稍具不规则纵裂;枝具灰色茸毛。小枝黄褐色被黄色长茸毛。叶互生奇数羽状复叶,小叶11—23枚;长圆形至披针形,长5—12厘米,先端渐尖,边缘具锯齿,基部圆形或广楔形;表面绿色,背面苍白色,均被茸毛,老后脱落。花雌雄异株;花序顶生,为直立圆锥花丛,长10—20厘米,密被茸毛;花淡绿色,雌花花柱具红色刺毛。小核果扁球形,被红色短刺毛,聚生为紧密的火炬形果穗,种子扁圆形,黑褐色,种皮坚硬。原产北美,广泛分布于加拿大东南之 Rhus typhina L. is a genus Aristolochia, shrub or small tree, up to 10-12 meters. Bark dark brown, slightly irregular longitudinal; branches gray hair. Branchlets yellowish brown yellow hairy hair. Leaves alternate with odd pinnate, leaflets 11-23; oblong to lanceolate, 5-12 cm long, apex acuminate, margin serrate, base rounded or broadly cuneate; surface green, pale back, Are hairy, old and fall off. Flowers dioecious; inflorescences terminal, as erect cone flowers, 10-20 cm long, densely hairy; flowers pale green, female flowers with red barbs. Small drupe flat-globose, short red bristles hairy, clustered into close torch shaped ears, seeds oblate, dark brown, hard seed coat. Native North America, widely distributed in southeastern Canada