Note: Rhus a. var. simplicifolia, with unifoliolate leaves (having a single leaflet), is not recognized in the Jepson eFlora
Distribution: Left: S.D. County Plant Atlas (http://sdplantatlas.org): Dots: var. aromatica; x: var. simplicifolia. Right: CCH2. Orange: var. aromatica; Red: var. simplicifolia; click to see current herbarium records.
Rhus aromatica var. aromatica
A shrub (0.5–2.5 meters tall). Leaves are ternately compountd, the terminal leaflet sessile (unlike Toxicodendron diversilobum in which the terminal leaflet is petiolulate)
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Rhus aromatica var. simplicifolia
A shrub (0.5–2.5 meters tall). Leaves are unifolioloate, only the terminal leaflet developing. Courtesy of Don Rideout (iNat350721742).