276 NEBRASKA STATE HORTICULTURAL SOCIETY. 



In some of our parks may be found the Horsechestnut with 

 large leaves, and also the Buckeye with similar but smaller leaves. 



3. Leaves in twos, medium sized, with 3 or 5 sharp lobes; seed pods 



in pairs, each with a wing Maples (Acer) 



We have two or three maples that are common in our parks, viz.: 

 the native Silver Maple (Acer saccharinum) with a silver colored 

 back to each leaf; the Sugar Maple (Acer saccharum) from the 

 east, with greenbacked, slightly downy leaves; and the Norway 

 Maple (Acer platanoides) from Europe, with smooth green leaves. 



4. Leaves in twos, large, divided into 3 to 7 pinnate leaflets, seed 



pods like those of Maples Box-Elders (Acer negundo) 



5. Leaves in twos, large, divided into 5 to 9 pinnate leaflets; pods 



single (not in pairs), winged Ashes* (Fraxinus) 



We have several species of Ash trees, as the White Ash (Fraxinus 

 americana). Green Ash (Fraxinus lanceolata) and Red Ash (Frax- 

 inus pennsylvanica) , but they are difficult to distinguish. The 

 Green Ash is the most common kind in Nebraska. 



B. Leaves alternate, that is, only one at each joint of the twig. 

 1. Leaves not lobed. 



a. Leaves narrow Willows (Salix) 



There are many species of willows, including the Weeping Willow 

 (Salix babylonica) with pendent twigs, the Golden Willow (Salix 

 vitellina) with bright yellow twigs; the White Willow (Salix alba) 

 with gray twigs, all from Europe, besides many native species. 

 &. Leaves regularly heart-shaped; tall trees. .Cottonwoods (Populus) 

 We have the native Missouri Cottonwood (Populus sargcntii) 

 with a spreading top, the Carolina Poplar (really a cottonwood) 

 (Populus angulata) with a closer top, and the Lombardy Poplar 

 (Populus dilatata) with a very narrow, pillar-like top. 



c. Leaves regularly heart-shaped: small trees, 



Red-Bud (Cercis canadensis) 

 This produces pink blossoms before its leaves appear. 



(Z. Leaves irregularly heart-shaped (lop-sided) Lindens (Tilia) 



The native "Basswoods" (Tilia americana) with large leaves, 

 and one or two European species with smaller leaves, are commonly 

 planted. 



e. Leaves broadest about the middle Elms (Ulmus) 



Three species are common, namely the American White Elm 

 (Ulmus americana) with a beautifully spreading top, the finest 

 looking of all our trees: the Slippery Elm (Ulmus fulva) with an 

 irregular top and a "slippery" inner bark; and the English Elm 

 (Ulmus campestris) with a compact, regular top. 



Here may be placed the native Hackberry (Celt is occidentalis) 

 Osage Orange (Toxylon pomiferun), Crab Apple (Mains ioensis). 



