|elm (Ulmus spp.)||
elm (Ulmus spp.; ELM FAMILY [Ulmaceae]) Small to large trees, often with deeply furrowed bark and slender branches. Leaves simple, alternate, lop-sided at the base, with doubly-toothed margins, strictly parallel lateral veins, and short petioles. Fruits are distinctively disk-shaped and winged. Three species are common in Wisconsin, and all are being lost to Dutch elm disease. American elm is particularly susceptible, and ironically is the one that was planted so widely as a street tree. It now survives essentially only where it is protected by regular injections of fungicide. 
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