35 t] flora of COLUMBIA AND VICINITY 213 



Order 37. RUBIALES. 

 Family 102. RUBIACEAE B. Juss. Madder family. 



372. HOUSTONIA L. Bluets. 



869. H. angustifolia Michx. Cliff bluets. 

 Common on the cliffs of the Missouri. 

 Illinois to Kansas; Florida to Texas. 



373. OEPHALANTHUS L. Button-bush. 



S70. C. occidentalis L. 



In swamps and about ponds and streams. 

 New Brunswick and Ontario to Wisconsin and Nebraska; 

 Florida to California; Cuba. 



374. DIODIA Gronov. Button-weed. 



871. D. teres Walt. Rough button-weed. 

 Roadsides and dry banks of the Waterworks dam. 

 Connecticut to Illinois and Kansas; Florida to New 



Mexico and Sonora. 



375. GALIUM Tourn. Bedstraw. 



872. G. concinnum T. & G. Shining bedstraw. 

 Very common in oak woods and thickets. 



New Jersey to Minnesota; Virginia to Arkansas and 



Kansas. 



873. G. trifldum L. Small bedstraw. 

 In swales; scarce. 



Maine and Michigan to Missouri, Colorado and north- 

 ward. 



874. G. tinctorium L. [G. trifidimt latifoliimt Torr.]. 

 Wild madder. 



Frequent in damp woods and swamps. 

 Canada to Michigan and South Dakota; North Carolina 

 to Arizona. 



