154 SAPINDALES 



Rootstock superficial, stems 0.5-2.5 dm. high, leaves not pale be- 

 neath, obscurely veined. 2. C. richardsiana. 

 Leaves, at least those of the branches, linear, western plants. 



3. C. pallida. 



1. Comandra umbellata (L.) Nutt. Toad-flax. 

 In the southeastern part of the state. Ft. Robinson; Hooper; Lincoln; 

 Weeping Water; Valentine. 



2. Comandra richardsiana Fernald. 

 Ponca. 



3. Comandra pallida A. DC. , 



In dry soil in the western part of the state. Banner County; Cherry 

 County; Sioux County; Ewing; Thedford; Stratton. 



Order SAPINDALES. 



Leaves opposite. 



Leaves palmately compound. 1. Hippocastanaceae. 



Leaves simple or pinnately compound. 2. Aceraceae. 



Leaves alternate in our species. 

 Leaves compound in our species. 



Flowers in terminal or axillary panicles, fruit a small drupe. 



3. Anacardiaceac. 

 Staminate flowers in drooping aments, the pistillate solitary or 

 several together, fruit a nut covered with husk. 



4. Juglandaceae. 

 Leaves simple, the staminate flowers in aments. 



Style branches 2, pistillate flowers in aments except in Corylus. 



5. Betulaceae. 

 Style branches 3 or more, pistillate flowers not in aments sub- 

 tended by an involucre which becom.es a bur or cup in fruit. 



6. Fagaceae. 



1. HIPPOCASTANACEAE. 



Aesculus. 609. 

 1. Aesculus glabra Willd. Ohio Buckeye. 



In the southeastern part of the state. 



2. ACERACEAE. 

 Acer. 607. 



Leaves simple. 



Leaves 1-1.5 dm. long, silvery white and pubescent beneath, eastern. 



1. A. saccharinum. 



Leaves 3-8 cm. long, glabrous on both sides, western. 2. A. glabrum. 

 Leaves pinnately compound. 3. A. negundo. 



1. Acer saccharinum L. Soft Maple. 

 Along streams in the southeastern part of the state. Lincoln; Nebras- 

 ka City; Wymore. 



2. Acer glabrum Torr. Mountain Maple. 

 In canons in the northwestern part of the state. Hat Creek Basin; 

 Squaw Canon. 



