88 GUTTIFERALES 



yellow. 

 Leaves at least some of them lobed or divided. 

 Leaves lobed, the terminal lobe broad. 



Basal lobes usually many, cleistogamous flowers on horizontal 

 or deflexed peduncles. 1. V. palmata. 



Basal lobes usually few, cleistogamous flowers on erect pe- 

 duncles. 5. V. sagittata. 

 Leaves pedately divided, into narrow lobes. 3. V. pedatifida. 

 Leaves merely serrate or dentate. 



Leaves broad, cordate or truncate at the base. 

 Glabrous or nearly so. 



Cleistogamous flowers on erect peduncles, leaves often 

 toothed at the base. 5. V. sagittata. 



Cleistogamous flowers on deflexed peduncles. 



4. V. papilionacea. 

 Villous pubescent. 2, V. sororia. 



Leaves narrowly lanceolate, tapering at the base. 



6. V. lanceolata. 

 Caulescent, stems leafy, flowers often yellow. 

 Stipules not laciniate. 



Leaves tapering into margined petioles. 7. V. nuttallii. 



Leaves cordate or truncate at the base. 



Petals lemon-yellow, leaves crenate-dentate. 



8. V. scabriuscula. 



Petals not yellow, leaves merely serrate. 9, V. canadensis. 



Stipules laciniate, large and foliaceous. 10. V. rafinesquii. 



1. Viola palmata L. 



In woods in the eastern part of the state. Omaha; Peru; Red Cloud. 



2. Viola sororia Willd. 



Viola palmata sororia (Willd.) Pollard. 

 Lincoln; Red Cloud. 



3. Viola pedatifida G. Don. 



Common on the prairies in the eastern part of the state. Callaway; 

 Falls City; Lincoln; Nebraska City; O'Xeill; Tecumseh. 



4. Viola papilionacea Pursh. 



In woods and thickets especially along streams over most of the state. 

 Fairbury; Lincoln; Scotia. 



6. Viola lanceolata L. 



In wet meadows not common. Atkinson; Lynn. 



7. Viola nuttallii Pursh. 



In dry soil in the western part of the state. Alliance; Cuba; Ft. Rob- 

 inson; Scotts Bluff County; Valentine. 



8. Viola scabriuscula (T. & G.) Schwein. 



In woods and thickets in the eastern part of the state. Lincoln; Long 

 Pine; Nebraska City; Peru; Roca. 



9. Viola canadensis L. 



In woods, mostly along the Missouri and the Niobrara. Bellevue; Bel- 

 mont; Cuba; Pine Ridge; Ponca; Ft. Robinson; Sioux County. 



10. Viola rafinesquii Greene. 

 Viola tenella Muhl. 



Introduced in the eastern part of the state. Blue Springs; Stella. 



