.760 



MANUAL OF POISONOUS PLANTS 



Fig. 439c. Chicory (Chicorium Intybus). a, part of plant 

 with several heads; b, single head side view; c, single flower 

 with strap shaped corolla; d, achenium with small chaffy scales. 

 (U. S. Dept. Agrl.) 



Distribution. Common in eastern states, Canada (Manitoba) and occasion- 

 •ally in Wisconsin, Illinois, Iowa and Utah. 



Poisonous properties. The plants are more or less bitter and not liked by 

 •cattle. Their milky juice probably contains some active principle. 



3. Lacfuca (Tourn.) L,. Lettuce 



Tall, leafy-stemmed herbs with milky juice and alternate leaves; flowers 

 "white, yellow or blue, in panicled heads ; involucre cylindrical, bracts imbricated 

 in two or more series; receptacle flat, naked; anthers sagittate at the base; 

 achenes oval, oblong or linear, abruptly contracted into a beak, dilated at the 

 apex, bearing a soft white capillary or brown pappus. 



About 90 species, natives of the northern hemisphere. Garden lettuce (L. 

 jativa), native to Europe, is cultivated. 



Lactuca Scariola L. Prickly Lettuce 

 Tall, erect herbs, annual or winter annual, 2-6 feet high, simple or branched 

 .•except the lower part of the stem which has stiff bristles; leaves glaucous, 

 .green, smooth except the midrib which is beset with weak prickles; lanceolate 



