12 CIRCULAR 62 5, U. S. DEPARTMENT OF AGRICULTURE 



A. Leaflets obovate to oblong, large or small. 



B. Plants large, usually with 5 flowers, stems mostly smooth, leaflets 

 midlarge. 



C. Stems smooth or slightly hairy. 



D. Leaflets smooth, or with few scattering hairs. 

 Calyx teeth about as long as the calyx tube 



var. arvensis (Schkuhr) Ser. 

 Stems ascending, long internodes. 

 Leaflets very large. 



Flowers 1 cm. long, plants robust 3 to 5 dm. high 



f. silvaticus Baumg. 

 Flowers over 1 cm. long, plants 3 to 4 dm. high 



f. grandiflorus Rouy. 

 Leaflets medium or small. 



Leaflets medium f. genuinus Posp. 



Flowers reddish yellow to red 



f. rubriflorus Lamotte. 

 Flowers yellow with red keel 



f. variegatus A. and G. 



Leaflets small f. parvifolius Peterm. 



Stems decumbent, short internodes f. alpestris Lamotte. 



Calyx teeth about one-third as long as the calyx tube 



var. microdon Peterm. 

 D. Leaflets hairy or with long ciliate hairs. 



Plants ordinary type, but leaflets long ciliate 



var. ciliatus Koch. 

 Leaflets small, thick stems, branches decumbent 



var. crassifolius (Pers.) Ser. 

 Leaflets very small, 3 to 6 mm. long__f. -parvifolius Rouy. 

 C. Stems densely hairy. 



Stems ascending, 2 to 4 flowers var. hirsutus Koch. 



Plants very dense, medium-size leaflets 



f. pilosissimus (Schur) Rouy. 



Plants procumbent, small leaflets f. minor Rouy. 



Stems decumbent var. delorti (Timb.) Rouy. 



Stems much branched, medium size leaflets, flowers small, 



bright yellow f. symmetricus (Jord.) Rouy. 



Stems moderately branched, leaflets very small 



f. parvifolius Rouy. 

 B. Plants small with 1 to 3 flowers, stems more or less hairy, leaflets small 



var. alpinus Ser. 

 A. Leaflets lanceolate to linear, small. 



B. Calyx teeth much longer than the short calyx tube 



var. preslii (Ten.) A. and G. 



. Plants medium large, entirely without hairs f. glaber (Rouy) A. and G. 



Plants small, quite hairy f. sibthorpii (Rouy) A. and G. 



B. Calyx teeth shorter or little longer than the calyx tube. 

 Plants medium or large. 



Plants rather long, hairy, 2 to 5 dm. high 



var. major (Scop.) Brand. 



Plants glabrous var. tenuifolius L. 



Stems 0.6 to 1.5 dm. long, upright 



f. sabulicola (Rouy) A. and G. 

 Stems 4 to 8 dm. long. 



Stems decumbent, branches elongated 



f. longicaulis (Martr.-Don) A. and G. 

 Stems erect, flower racemes with very long peduncle 



f. pedunculatus (Cav.) Rouy. 



All parts fine, leaflets small f. parvifolius Rouy. 



Leaflets rather thick or fleshy 



f. crassifolius (Lamotte) A. and G. 

 Plants very small var. microphyllus Hausskn. 



