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- 



