No. 14.] FLOWERING PLANTS AND FERNS. 4II 



open woods. May — Nov., especially in May. Naturalized 

 from Europe. 



Uses and properties as in Taraxacum officinale. 



SONCHUS L. Sow Thistle. 

 Sonchus arvensis L. (of cultivated ground) . 

 Field Sow Thistle. 



Rare. Roadsides and waste places: Norwich (W. A. Set- 

 chell), New London and Montville (Graves), Preston (Mrs. 

 E. E. Rogers), East Hartford (Weatherby), Bridgeport 

 (Eames). Late June — Sept. Naturalized from Europe. 



Sonchus oleraceus L. (suitable for a pot-herb). 

 Common Sow Thistle. 



Occasional. Waste and cultivated grounds. July — Oct. 

 Naturalized from Europe. 



Medicinal. 



Sonchus asper (L.) Hill (rough). 

 Spiny-leaved Sow Thistle. 



Rare to occasional. Waste ground and on shores. July — 

 Aug. Naturalized from Europe. 



LACTUCA L. Lettuce. 



Lactuca scariola L. 



Prickly Lettuce. 



Rare. Waste ground: New London (Graves), Naugatuck 

 (B. B. Bristol), Norwalk (Eames). July — Aug. Adventive 

 from Europe. 



The herb is medicinal. • 



Lactuca scariola L., var. integrata Gren. & Godr. (entire). 

 Lactuca virosa of American authors, not L. 

 Prickly Lettuce. 



Occasional. Waste ground, mostly near railroads or in 

 populous districts. Aug. — Sept. Naturalized from Europe. 

 The herb is medicinal. 



Lactuca canadensis L. 



Wild Lettuce. Horse-weed. 



Common. Fields and roadsides. June — Aug. 



The var. Montana Britton (of mountains), var. integri- 



