114 PAPILIONACEAE 



2. T. medium L. Like the last but leaflets not spotted, and flower 

 he<ads peduucled. — Independence and Courtney. Uncommon. May-Sep- 

 tember. 



3. T. hybridiun L. Alsike Clover. 1°-2° high, ascending : leaflets 

 obovate, serrate : flowers Z''-^" long, peduncled : pedicels l"-2'^long. — 

 Frequently adveutized in waste places. May-September. 



4. T. repens L. White Clover. Widely creeping : leaflets ob- 

 ovate to obcordate, serrate : flowers as in the last. — Very abundant in 

 fields, copses, etc. May-September. 



6. LOTUS L. 



Herbs with reddish-yellow flowers. Pods linear, 1-several-seeded. 



1. L. Americanus (Nutt. ) Bisch.' Prairie Trefoil. 6'-2° high, 

 erect, pubescent : leaflets oblong : flowers numerous : peduncles 1 flow- 

 ered, leafy-bracted : pod V long. Adventized along railroads at Shef- 

 field : also abundant along roads west of Lee's Summit. June-August. 



7. PSORALEA L. 



Leaves 3-5-foliolate. Flowers small, bluish, in racemes. Pods ovoid, 

 short, indehiscent, 1-seeded. 



Leaflets three. 



Plants canesceut. 1. P. iennifloia. 



Plants densely silvery-pubescent. 2. P. argtiplnjUa. 



Leaflets live. 3. P. escidcnla. 



1. P. tenuiflora Pursli. Bushy, 2°-4° high : leaflets oval to oblong : 

 racemes slender, few-many-flowered : pods ovate to ovoid, abruptly 

 beaked. — Common in rockj' barrens and prairies, especially in the south- 

 western part. May-July. 



2. P. argophylla Pursh. l°-2° high : leaflets oval-oblong : flowers 

 A" long, in interrupted spikes. — Adventized along the railroad three 

 miles south of Independence. May-.Tuly. 



3. P. esculenta Pursh. Prairie Titrxip. 12'-18^ high, whitish 

 villous-pubescent : leaves digitately .5-foliolate ; leaflets obovate: spikes 

 dense, often 3^ long. — Adveutized along railroad east of Sheflield. June. 



8. AMORPHA L. 



Shrubs with pellucid-dotted pinnate leaves and flowers in close spikes. 

 Corolla reduced to one petal, the standard, which is wrapped aronnd the 

 style and stamens. Stamens monadelphous below. Pod short, 1-2- 

 seeded. 



Leaflets 12'^-24'Mong. L A. fniticosa. 



Leaflets y^-1^^ long. 2. A. caneacens. 



1. A. fruticosa L. False Indigo. 5°-!.')° high, pubescent or gla- 

 brate : leallets 11-25, oblong-elliptical, short-stalked : spikes 3'-G' long : 

 flowers violet-purple. — Frccjuent along strejvms throughout. May-June. 



