Rhus glabra
Common name: 
Smooth Sumac
Rocky Mountain Sumac
Red Sumac
Western Sumac
roos GLAA-bra
Native to (or naturalized in) Oregon: 
  • Deciduous, thicket-forming shrub, to 15 ft (4.5 m) tall and similar spread, branches thick, pubescent and light reddish-brown at first, later becoming grayish-brown and smooth, covered with a waxy bloom, leaf scare horseshoe shaped.  Leaves alternate, pinnately compound, 30-45 cm long, 11-31 leaflets, each about lanceolate to oblong-lanceolate, 5-10 cm long, round base, apex acute or tapering, margins serrate, dark green above, pale green to whitish-green below; bright red fall color.  Dioecious, male and female plants.  Female flowers small, greenish-yellow to white, in elongated terminal clusters (panicles), 15-25 cm long.  Fruit bright red, glandular drupe, each about 5 mm, in dense, hairy clusters which remain on bare branches in winter.
  • Sun.  At its best in slightly acidic to neutral soils with sunny exposures, but grows well in a wide variety of soil types and conditions.  Sometimes considered an invasive weed.
  • Hardy to USDA Zone 3   Native to much of North America, from Maine to central British Columbia south to Florida and northern Mexico. Occasionally found central and eastern Oregon.   Hybridizes with Rhus typhina.
  • glabra: without hairs, smooth.
Click image to enlarge
  • plant habit, late spring

    plant habit, late spring

  • leaf


  • leaf,underside


  • leaf, comparison

    leaf, comparison

  • leafy shoot with young flower cluster

    leafy shoot with young flower cluster

  • stem, late spring

    stem, late spring

  • flower clusters and leaves

    flower clusters and leaves

  • flower cluster

    flower cluster

  • flowers


  • plant habit, fall

    plant habit, fall

  • leaf


  • stem


  • leaf, fall

    leaf, fall

  • fruit cluster, fall

    fruit cluster, fall