3S3J FLORA OF COLUMBIA AND VICINITY 24I 



430. MUL.GEDI\JM Cass. [LA CTUCAUl Blue 



LETTUCE. 



1043. M. Floridanuin(L.) DC. IL.F/oridana (L.)Ga.ertn.]. 

 Florida lettuce. 



Common on rich rocky hillsides. 



New York to Michigan and Nebraska; Florida to 

 Louisiana and Kansas. 



1044. M. leucophaeum DC. [L. leucophaea (DC.) Gray: 

 L. spicata (Lam.) Hitchc.]. Tall blue lettuce. 



Common in low grounds. 



Newfoundland to Manitoba; North Carolina to Ten- 

 nessee, Missouri and Colorado. 



43L SONCHUS L. Sow-thistle. 



1045. S. oleraceus L. Common sow-thistle. 

 Common in waste places. 



Old World, thence to the New. 



1046. S. asper (L.) All. Spiny-leaved sow-thistle. 

 Frequent in waste places. 



Old World, now cosmopolitan. 



1047. S. arvensis L. Field sow-thistle. 

 Common in waste places. 



Europe and Asia, thence to North America. 



432. LACTUGA L. Lettuce. 



1048. L. virosa L. Common prickly lettuce. 

 Abundant in waste grounds and unkept fields. 

 Europe, thence to North America. 



1049. L. Scariola L. Prickly lettuce. 



Waste places; less abundant than the preceding, with 

 which it has connecting forms. 



Europe, North Africa and Asia, thence to North 

 America. 



