PLANT LIFE IN OKLAHOMA. 61 



largest tree observed was in the Grrand Riyer Valley and was 10 inches 

 in diameter and more than 30 feet high. Often a large number of the 

 trees are found growing together. 



HOBSE^CHESTNUT FAMILY. HIPPOC'ASTANACEAE. • 

 HORSE CHESTNUTS. GENUS AESCULUS. 



Common horse chestnut. Yellow buckeye. (Sweet buckeye.) 



Aesculus Hippo castanum. Aesculus octandra. 



Ohio buckeye. (Sweet buckeye. Fetid buckeye.) 

 Aesculus glabra. 



GENUS KOELREUTERIA. 



Koelreuteria paniculata. 



MAPLE FAMILY. ACEEACEAE. 

 MAPLES. GENUS ACER. 



Silver maple. (Soft maple. White maple. Eiver maple.) 



Acer saccharinum. 



Red, scarlet, or water maple. (Swamp maple.) 



Acer ruhrum. 

 Hard maple. (Sugar or rock maple. Sugar-tree.) 

 Acer saccharum. 

 Black maple. (Sugar maple.) Box Elder. (Ash-leaved maple.) 



Acer nigrum. Acer negundo. 



The NORWAY MAPLE, acer platanoides, and CUT-LEAVED 

 JAPANESE MAPLE, acer palmatum, are in cultivation, but so far have 

 not made very successful growth in the localities where planted. 



BLADDEE-NUT FAMILY. STAEPHYLEACEAE. 



American Bladder-nut. 



Staphylea trifoliata. 



CASHEW FAMILY. ANACAEDIACEAE. 

 SUMACHS. GENUS RHUS. 



Smooth sumac. (Upland or scarlet sumac.) 



Rhus glabra. 



Dwarf, black or mountain sumac. (Upland sumac.) 



Rhus copallina. 



Poison sumac. (Poison dogwood. Poison elder.) 



Rhus Venenata. 



Cut-leaved sumac. Ill scented sumac. (Skunk bush.) 



Rhv^ lacinata. Rhus trilobata. ^ 



Fragrant or sweet-scented sumac. 



Rhus aromatica. 



Poison ivy. (Poison oak. Climath. Three leaf ivy.) 



Rhus radicans. 



Wild or American smoke tree. (Chittam wood.) 



Rhus cotinoides. 



