62 



45a. Racemes arising from the base of the plant, leafless (4 8 dm. 

 high; summer) Tick Trefoil, Desmodinm imdifloruni. 



45b. Racemes terminal or a few of them axillary; leaflets generally 

 more than 3 cm. long; pod (usually to be seen at the base of 

 the raceme) transversely segmented into 2 or more joints 

 (summer) (Tick Trefoil; the genus Desmodium. Pods are 

 usually necessary for satisfactory identification) 46. 



45c. Racemes short, loose, chiefly axillary; leaflets generally less 

 than 3 cm. long; the short ovate or ovoid pod no't transversely 

 jointed (5 10 dm. high; flowers in summer) (Bush Clover; 

 the genus Lespedeza. Reference to the Manual is recom- 

 mended) 58. 



46a. Leaves clustered near the summit of the stem (4 12 dm. 

 high) Tick Trefoil, Desmodium grandiflorum. 



46b. Leaves scattered on the stem 47. 



47a. Plants prostrate; racemes panicled; leaflets nearly circular 



Tick Trefoil, Desmodium rotundifolium. 



47b. Plants decumbent or ascending; racemes short, simple, few- 

 flowered; stipules ovate (stems 4 8 dm. long) 



Tick Trefoil, Desmodium pauciflorum. 

 47c. Plants erect or ascending; racemes panicled 48. 



48a. Leaflets of an oblong type, broadest at or near the middle, 

 and about 4 times as long as broad (5 10 dm. tall) 49. 



48b. Leaflets of an ovate or lanceolate type, broadest below the 

 middle, and not more than 3 times as long as wide 50. 



49a. Stem pubescent; leaves sessile or nearly so 



Tick Trefoil, Desmodium sessilifolium. 



49b. Stem glabrous or nearly so; leaves obviously petioled 



Tick Trefoil. Desmodium paniculatum. 



50a. Stipules lanceolate to ovate, 1 cm. long or more (6 15 dm. 



high) 51. 

 50b. Stipules narrowly lanceolate or subulate, less than 1 cm. 



long 54. 



51a. Stems glabrous or minutely pubescent; leaves acuminate 52. 

 51b. Stems hispid or densely pubescent; leaves ovate or ovate- 

 lanceolate, obtuse or barely acute 53. 



52a. Leaves glabrous on both -sides 



Tick Trefoil, Desmodium bracteosum. 

 52b. Leaves rough above, hairy beneath 



Tick Trefoil, Desmodium bracteosum var. long if oli inn. 



53a. Leaflets broadly ovate Tick Trefoil, Desmodium canescens. 



53b. Leaflets ovate-lanceolate 



Tick Trefoil, Desmodium illiuoense. 



54a. Flowers 1012 mm. long (12 m. high) 



Tick Trefoil, Desmodium canadeuse. 



54b. Flowers 5 8 mm. long (5 8 dm. tall) 55. 

 54c. Flowers 34 mm. long (48 dm. tall) 56. 



