30l] FLORA OF COLUMBIA AND VICINITY 1 59 



207. TRIFOLIUM L. Clover. Trefoil. 



524. T. procumbens L. Low hop-clover. 



A small patch in the thickets south of the University golf 

 links. 



Europe, thence to North America. 



525. T. dubium Sibth. [Z. procumbeTis minus (Smith) 

 Koch]. Least hop-clover. 



Pastures and old fields; rare. 

 Europe, thence to North America. 



526. T. hybridum L. Alsike clover. 

 Frequent in meadows and waste places. 



Europe, thence widely distributed as a meadow plant. 



527. T. repens L. White clover. Sheep clover. 

 Abundant in fields, lawns and waste places. 



Europe: Siberia: Sub-arctic America, now in the greater 

 part of North America. 



528. T. stoloniferum Muhl. Running buffalo clover. 



Rare in thickets back of Hinkson creek bluffs south. 



Ohio and Michigan to South Dakota; Kentucky to Mis- 

 souri. 



529. T. incarnatum L. Crimson clover. 

 Rare in meadows. 



Europe, thence to North America. 



530. T. pratense L. Red clover. 

 Common in meadows and fields. 



Europe and Asia, thence to North America. 



531. T. medium L. Mammoth clover. Zigzag clover. 

 Frequent in meadows and fields. 



Europe and Siberia, thence to North America. 



208. PSORALEA L. Pomme blanche. 



532. P. tenuiflora Pursh. 

 Summits of cliffs; local. 



Illinois and Minnesota to Montana; Missouri and Texas 

 to Colorado; Sonora. 



