PAPILIONACEAE 133 
7. Melilotus. 538. 
Flowers white. 1. M. alba. 
Flowers yellow. 2. M. officinalis. 
1. Melilotus alba L. White Sweet Clover. 
Introduced and becoming common throughout the state Ft. Robin- 
son; Kearney; Lincoln; Paddock; Thedford; Red Cloud; Wymore. 
2. Melilotus officinalis L. Yellow Sweet Clover. 
Introduced throughout most of the state. Long Pine; Lincoln; Plain- 
view; Rushville; Wymore. 
8. Medicago. 538. 
Flowers yellow, pod 1-seeded. 1. M. lupulina. 
Flowers blue or violet, pods several seeded. 2. M. sativa. 
1. Medicago lupulina L. Yellow Trefoil. 
Introduced in the eastern part of the state. Its seeds are sometimes 
mixed with alfalfa seeds. Lincoln; Plainview; Valentine; Wood 
River. 
2. Medicago sativa L. Alfalfa, Lucerne. 
Extensively cultivated and often escapes. Broken Bow; Red Cloud; 
Rushville. 
9. Lotus. 541. 
1. Lotus americanus (Nutt.) Bisch. 
Hosackia americana (Nutt.) Piper. 
In dry soil over most of the state. Anselmo; Belmont; Broken Bow; 
Buffalo County; Cherry County; Fairmont; Hooker County; Lincoln; 
Mullen; Nelson; Plainview; Red Cloud. 
10. Robinia. 549. 
1. Robinia pseudacacia L. Black Locust. 
Escaped along streams in the southeastern part of the state. Lin- 
coln; Peru. 
11. Cracca. 548. 
1. Cracca virginiana L. 
Rare in the southeastern part of the state. Fairbury. 
12. Aragalus. 555. 
Scape 2-3 dm. high, many flowered, pod exserted from the calyx. 
Leaflets narrowly oblong to linear-lanceolate, grayish pubescent. 
1. A. lambertii. 
Leaflets broadly oblong, 4% to 1 cm. side, silky-villose. 2. A, sericeus. 
Scape 1-3 cm. long, 1 to 3 flowered, pod included in the calyx. 
3. A. multiceps. 
1. Aragalus lambertii (Pursh.) Kuntze, Loco-Weed. 
Common in the western part of the state. Banner County; Box Butte 
County; Culbertson; Emerson; Thedford; Minden; Valentine. 
