• SALICACEAE 69 



Leaves remotely denticulate, 2-3 teeth to each cm. 



6. S. fluviatilis. 

 Leaves finely serrate. 



Leaves green or glaucous beneath; teeth gland tipped. 



Leaves green on both sides, lighter beneath, staminate ament 

 2 cm. long. 4. S. cordata. 



Leaves glaucous beneath, staminate amends 3 cm. long. 



5. S. missouriensis. 

 Leaves grayish pubescent beneath. 8. S. bebbiana. 



Leaves entire, undulate or slightly denticulate or serrate. 

 Leaves not densely tomentose beneath. 



Leaves 1 cm. or more wide, glabrate in age. 7. S. perrostrata. 

 Leaves less than 1 cm. wide, permanently silky. 6. S. fluviatilis. 

 Leaves densely tomentose beneath. 

 Petioles 4 mm. long, or more. 



Stipules desiduous, petioles 4-12 mm. long. 8. S. bebbiana. 

 Stipules commonly persistent, petioles 4-6 mm. long. 



9. S. humiiis. 

 Petioles 2 mm. long. 10. S. tristis. 



1. Salix nigra Marshall. Black willow. 

 In low, wet places mostly along streams, in the eastern part of the 

 state. Fairbury; Nemaha; Peru; Wahoo. 



2. Salix amygdaloides Anders. Peach-leaved willow. 

 Along streams over most of the state. Crete; Ewing; Lincoln; Nance 

 County; O'Neill; Red Cloud; Saunders Sounty; St. James. 



3. Salix lucida Muhl. Glossy willow. 

 Along streams in the eastern part of the state. Fairbury; Weeping 

 Water. 



4. Salix cordata ]\Iuhl. 



Common, especially along streams and on wooded islands. Belmont; 

 Burwell; Cherry County; Long Pine; :\Iullen; Norway; Peru; Tal- 

 mage; Thedford. 



5. Salix missouriensis Bebb. 



Along streams in the southeastern part of the state. Minden. 



6. Salix fluviatilis Nutt. Sand-bar willow. 

 Salix longifolia Muhl. 



Com_mon forming dense thickets in wet places mostly along streams. 

 Crete; Lincoln; Milford; Peru; Scotts Bluff County; Thedford; Weep- 

 ing Water; Valentine. 



7. Salix perrostrata Rydb. 



In the northwestern part of the state. Pine Ridge. 



8. Salix bebbiana Sar. 



In dry soil in the western part of the state. Belmont. 



9. Salix humiiis Marshall. 



In dry prairies. Anselmo; Cass County; Cherry County; Crete; Long 

 Pine; Weeping Water; Ewing; Minden. 



10. Salix tristis Ait. 

 Reported from Anselmo. 



4. PORTULACACEAE. 



Ovary superior, capsule not circumscissile. 



Stamens 10 or more, seeds numerous. 1. Tallnum. 



