Photo: Toxicodendron rydbergii 1.

Leaf. Botanical garden Kumpula, Helsinki, Finland. Planted. 2002-07-26.

Toxicodendron rydbergii (Small ex Rydb.) Greene
Engl.: western poison ivy, Rydberg's poison ivy.
Suom.: myrkkysumakki.
Sven.: giftsumak.
Bot. syn.: Rhus radicans L. var. rydbergii (Small ex Rydb.) Rehd., Rhus radicans L. var. vulgaris (Michx.) DC., Toxicodendron desertorum Lunell