98 - POLEMONIALES 



2. CONVOLVULACEAE. 



Green plants with normal leaves. 



Styles distinct to the base, each 2-cleft, leaves sessile. 1. Evolvulus. 

 Styles united to the stigmas. 



Stigmas ovoid or sub-globose, ovary usually 3-celled or the leaves 



linear. 2. Ipomoea. 



Stigmas filiform to oblong-cylindric, ovary 2-celled, leaves never 



linear. 3. Convolvulus. 



Yellowish plants, leaves reduced to small scales. 4. Cuscuta. 



1. Evolvulus. 751. 



1. Evolvulus nuttalianus R. & S. 



In dry sandy soil in the western part of the state. Deuel County; 

 Fairbury; Kearney; Merriman; Minden; Valentine. 



2. Ipomoea. 751. 



Leaves linear, stems not trailing or twining. 1. !. leptophylla. 



Leaves broadly ovate, cordate, stems trailing or twining. 

 Leaves entire, sepals acute usually less than 15 mm. long. 



2. I. purpurea. 

 Leaves 3-lobed, sepals with long linear tips, over 15 mm. long. 



3. I. hederaceae. 



1. Ipomoea leptophylla Torr. Bush Morning-Glory. 



In dry soil, mostly in the sand-hills and in the western part of the 

 state. Ainsworth; Banner County; Benkleman; Custer County; Deuel 

 County; Lincoln; Long Pine; Plummer Ford; Royal; Weigand; 

 Valentine. 



2. Ipomoea purpurea Lam. Morning-Glory. 

 Sometimes escapes from cultivation. Richardson County. 



3. Ipomoea hederacea Jacq. 



Introduced in the eastern part of the state. Havelock; Lincoln; 

 Richardson County; Red Cloud. 



3. Convolvulus. 753. 



Bracts large, enclosing the calyx. 



Glabrous or slightly hairy, leaves 5 cm. or more long, hastate, 



the lobes acute, often sinuate-dentate. 1. C. amerlcanus. 



Densely pubescent, leaves 5 cm. or less long, sagittate, the lobes 



rounded, entire. 2. C. Interior. 



Bracts small, remote from the calyx. 



Plant glabrous or nearly so, leaves hastate, entire. 3. C. arvensis. 

 Plant canescent, leaves usually lobed or dissected. 



4. C. hermannioides. 



1. Convolvulus americanus (Sims.) Greene. Large Bind-Weed. 

 Convolvulus sepium L. 



A common weed throughout most of the state. Fairbury; Indianola; 

 Lincoln; Ponca; Valentine. 



2. Convolvulus interior House. 

 Convolvulus repens L. 



Common as a weed over a large part of the state. Callaway; Fair- 

 bury; Plainview; Red Cloud. 



