PLANTS POISONOUS TO STOCK. 



255 



from mature potatoes are likewise poisonous. In all of these cases the 

 deleterious suhstance may be removed or destroyed by thorough boiling. 



SCROPHULARIACEiE (fIGWORT FAMILY). 



Digitalis purpurea. — The purple foxglove is a common garden plant 

 which has sparingly escaped from 

 cultivation and is. naturalised to 

 some extent on Cape Breton Island. 

 Horses are occasionally poisoned 

 in Europe by nipping the plants 

 from gardens or by eating hay 

 contaminated with it. 



Gerardia tenui folia. — The 

 slender gerardia is native to the 

 eastern half of the United States, 

 and has been specially reported as 

 poisonous to sheep and to calves 

 in the Southern States. 



Gratiola officinalis. — The hedge 

 hyssop of the Southern States 

 contains an acrid poison. The 

 same plant grows in Europe, and 

 is there regarded as poisonous to 

 stock. 



Pedicularis. — The plants of this 

 genus are commonly called louse- 

 wort. In Europe several species 

 are suspected of being slightly 

 poisonous to stock. One of these, 

 P. palustris, occurs in Labrador, 

 and there are over thirty species 

 native to the United States, largely 

 Western. They should all be suspected of being poisonous 



Fig. 113. — Siieezeweed [Helinuiim au- 

 tainnalc), one-third natural size. 



CAMPANULACE.E (bELL-FLOWER FAMILY). 



Lobelia inflata, Indian tobacco : L. kalmii, brook lobelia : L. spicata, 



pale-spiked lobelia : L. syphilitica, great lobelia.- — All of the species in 

 this genus contain an acrid and usually milky juice, and are poisonous. 

 None has been specially reported as poisonous to stock, but the above- 

 named species are to be suspected, because they fre(j[uently occur in 

 grass and are sometimes found in meadow hay. 



