Ulmaceae

 

The Ulmaceae is represented by elms (Ulmus) and hackberry (Celtis).  The latter was a popular shade tree in the Western U.S.  The former was popular here in the east, partricularly Ulmus americana, the American elm.

Web Links Ulmus pumila - in front of the Museum of Natural History, Smithsonian Institute, Washington, D.C.  It was planted as a replacement for the lost American elm trees that first grew on this spot.

 

elmleaftxt.jpg (71421 bytes)

 This is the leaf of Ulmus americana as it is found on the campus of Penn State University.  The species took a serious hit from Dutch Elm Disease, and basically we have lost the species.

hackberryleaftxt.jpg (22835 bytes)

 This is the leaf of Celtis occidentalis, hackberry, as it was found along North River behind the Bridgewater College campus.

samaratxt.jpg (17466 bytes)

 The fruit of elms is an achene.  It is a dry, one seeded indehiscent fruit, and when the wing is added, as shown here, the fruit is called a samara.

webelmspennstate1.jpg (48616 bytes)

 This is a surviving stand of american elm at Penn State University.  These elms receive whatever current treatment is possible to keep the disease under control.  Obviously these trees thrive at this location.