Jones: Flora of Illinois, 84. Leguminosae 163 



7. Corolla white, shorter than the calyx; gravelly soil, roadsides, fields, 



or open woods; nat. from Eur. June-Sept. Rabbit-foot Clover 



T. arvense L. 



7. Corolla crimson, longer than the calyx; cult, and occasionally spont. 

 in fields and waste places; introd. from Eur. June-July. Crimson 

 Clover T. incarnatum L. 



6. Heads subglobose or ovoid, 2-3 cm. in diameter; celyx sparsely pilose, 

 the teeth subulate; corolla magenta (or white), 12-15 mm. long; 

 leaflets usually with a pale mark; roadsides, fields, and waste places, 



common; nat. from Eur. May-Aug. Red Clover T. pratense L. 



1. Flowers yellow, shortly pedicellate, becoming reflexed in age. 



8. Leaflets sessile; stipules linear; heads 1-2 cm. in diameter; roadsides, fields, 



and open woods; nat. from Eur. June-July. Yellow Hop-clover 



T. agrariiim L. 



8. Terminal leaflet petiolulate; stipules ovate-lanceolate; heads 4-12 mm. in 

 diameter. 



9. Heads 20-40-flowered; standard distinctly striate; roadsides, fields, and 



waste places; nat. from Eur. June-Aug. Low Hop-clover 



T. prociimbens L. 



9. Heads 3-15-flowered; standard faintly striate; roadsides and waste 



places; nat. from Eur. June-July. Little Hop-clover 



T. dubium Sibth. 



12. Melilotus Hill — Sweet Clover 

 1 . Corolla yellow, 5-7 mm. long; standard about as long as the wing-petals; 

 pods 3-4 mm. long; waste places, fields, and roadsides; nat. from Eur. 

 June-Sept. Yellow Sweet Clover M. officinalis (L.) Lam. 



1. Corolla white, 3-4.5 mm. long; standard slightly longer than the wing-petals; 

 pods 2-3 mm. long; waste places and roadsides; nat. from Eur. May-Sept. 

 White Sweet Clover M. alba Desr. 



13. Medicago L. 



1. Flowers bluish purple, 7-9 mm. long; pods spirally coiled, pubescent; leaflets 

 oblanceolate, 1.5-3 cm. long; perennial; fields and roadsides, common; 

 nat. from Eur. May-Sept. Alfalfa M. saliva L. 



1. Flowers yellow, 2-3 mm. long; pods 1 -seeded, reniform, curved, reticulate, 

 pubescent, black when ripe; prostrate or ascending annual; fields and 



waste places, common; nat from Eurasia. May-July. Black Medic 



M. lupulina L. 



14. HOSACKIA Dougl. 

 (Acmispon Raf.) 

 H. americana (Nutt.) Piper. Dry soil, rare. Greene Co., McDonald; and 

 westw. June-Aug. 



15. Psoralea L. 



1. Leaves pinnately 1-3-foliolate; pods rugose-reticulate. 



