Acer negundo Linnaeus var. negundo . Section: Negundo. Eastern Box Elder, Ash-leaved Maple, River Maple, Arce, Fresno de Guajuco. Phen: Mar-Apr; May-Oct. Hab: Riverbanks, swamps, bottomlands, also upslope on calcareous substrates. Dist: The species ranges nearly across North America, including well into the arid west along rivers. Var. negundo occurs from NB west to MB, south to c. peninsular FL and TX.

ID notes: Acer negundo often grows on the banks of rivers, leaning out over the water at a 45° angle. The leaves can resemble poison ivy (Toxicodendron radicans), which is easily distinguished by having alternate leaves. The coarse toothing (approaching lobing) distinguishes it readily from any of our ashes (Fraxinus).

Origin/Endemic status: Native

Synonymy: = C, K3, K4, Mo2, NcTx, NY, Tx, Va; < Acer negundo L. – Fl4, GW2, Mi, Pa, RAB, Tn, W, WH3; > Acer negundo L. var. negundo – Ar, F, G, GrPl, Il, K1, K3, NE, Murray (1970); > Acer negundo L. var. violaceum Booth ex G.Kirchn. – F, G, GrPl, Il, K1, K3, NE, Murray (1970); < Negundo negundo (L.) H.Karst. – S; < Rulac negundo (L.) Hitchc.

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