140 Order ROSALES 
5. Crotalaria. 536. 
1. Crotalaria sagittalis L. Rattle-box. 
Lowlands along streams in the eastern part of the state. Dakota 
county; Peru; Walton. 
6 Trifolium. 539. 
Flowers white or rose-colored, brownish 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. stoloniferum. 
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. 
Flowers yellow. 6. T. procumbens. 
1. Trifolium reflexum L. Buffalo Clover. 
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. 
6. Trifolium procumbens L. Hop-clover. 
Lincoln. 
7. Melilotus. 538. 
Flowers white. 1. M. alba: 
Flowers yellow. 2. M. officinalis. 
1. Melilotus alba Desv. White Sweet Clover. 
Introduced and becoming common throughout the state. Ft. Robin- 
son; Kearney; Lincoln; Paddock; Red Cloud; Thedford; Wymore. 
2. Melilotus officinalis (L.) Lam. Yellow Sweet Clover. 
Introduced throughout most of the state. Lincoln; Long Pine; 
Plainview; Rushville; Wymore. 
8. Medicago. 538. 
Flowers yellow; pod 1-seeded; annual. 1. M. lupulina. 
Flowers blue or violet; pods several-seeded; perennial. 2. M. sativa. 
1. Medicago lupulina L. Yellow Trefoil. 
Introduced in the eastern part of the state. Its seeds are sometimes 
Sm with alfalfa seeds. Lincoln; Plainview; Valentine; Wood 
iver. 
2. Medicago sativa L. _ Alfalfa, Lucerne. 
Extensively cultivated and often escapes. Broken Bow; Red Cloud; 
Rushville. 
9. Hosackia (Lotus). 541. 
1. Hesackia americana (Nutt.) Piper. Prairie Trefoil. 
In dry soil over most of the state. Anselmo; Belmont; Broken Bow; 
