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Shrubs or small trees with pithy twigs and milky or watery juice; leaf-scars alternate, more than 2-ranked; bundle-scars numerous scattered or in a single curved line; stipule-scars absent; terminal bud present or absent; fruit a small drupe borne in erect or drooping clusters. Some species (often placed in the genus Toxicodendron) produce an oil that irritates human skin. |
| 152. | Terminal bud present; fruit smooth white in loose drooping clusters. | |
| 152. | Terminal bud absent; fruit more or less hairy, red, in dense erect clusters. | 153 |
| 153. | Leaf-scars narrow, V-shaped, nearly encircling the buds; cut twig showing milky juice. | 154 |
| 153. | Leaf-scars broader; inversely triangular to broadly crescent-shaped; twig with watery juice and resinous taste. | Rhus
copallina, Shining Sumac |
| 154. | Twigs (especially current growth) densely hairy. | Rhus
typhina, Staghorn Sumac |
| 154. | Twigs smooth . | Rhus
glabra, Smooth Sumac |