132 ROSALES 



4. Lupinus. 536. 



Perennials, 3-10 dm. high; pubescence silky. 

 Calyx not spurred at the base. 



Leaves glabrous above at least in age, corolla pale blue with a 

 dark spot on the banner. 1. L. plattensis. 



Leaves permanently pubescent above, corolla not spotted. 



3. L. decumbens. 



Calyx spurred at base. 2. L. argophyllus. 



Annuals, 1-3 dm. high; pod 2-seeded. 4. L. pusillus. 



1. Lupinus plattensis S. Wats. 



Prairies in the northwestern part of the state. Alliance; Belmont; 

 Box Butte County; Pine Ridge; Sioux County. 



2. Lupinus argophyllus (A. Gray.) Cockerel. 



In the extreme western part of the state. War Bonnet Canon. 



3. Lupinus decumbens Torr. 



In prairies in the northwestern corner of the state. Banner County; 

 Hat Creek Basin; Scotts Bluff County. 



4. Lupinus pusillus Pursh. 



Prairies in the western part of the state. Crawford; Deuel County; 

 Lewellen; Lodge Pole. 



5. Crotalaria. 536. 



1. Crotalaria sagittalis L. 



Lowlands along streams in the eastern part of the state. Dakota 



County; Peru; Walton. 



6. Trifolium. 539. 



Flowers white or rose-colored, browish- in age, pedicelled. 

 Calyx teeth twice as long as the tube. 



Stem and calyx hairy. 1. T. reflexum. 



Stem and calyx glabrous or nearly so. 2. T. stolon if erum. 

 Calyx teeth not longer than the tube. 



Stems erect or ascending. 4. T. hybridum. 



Stems creeping, rooting at the nodes. 3. T. repens. 



Flowers red or purple, sessile in dense heads. 5. T. pratense. 



1. Trifolium reflexum L. 



Introduced but not common. Diller; Fairbury; Lincoln. 



2. Trifolium stoloniferum Muhl. 



Open woods, rare. Lincoln; Louisville. 



3. Trifolium repens L. White Clover. 

 Common, escaped from cultivation, probably throughout the state. 

 Lincoln. 



4. Trifolium hybridum L. Alsike or Swedish Clover. 

 Often escapes from cultivation. Lincoln. 



5. Trifolium pratense L. Red Clover. 

 Frequently escapes from cultivation in the eastern part of the state. 

 Lincoln; O'Neill. 



