758 MANUAL OF POISONOUS PLANTS 



Style branches truncate or with hairy tips. HcEnieas. 



Bracts of the involucre spreading. 



Receptacle naked ; bracts of involucre spreading or reflexed at 



maturity 17. Helemum 



Bracts of the involucre united 18. Dysodia 



Style branches mostly truncate with brush hairs on the tip. 



Anthem iDE.Ai;. 

 Pappus of short scales or a crown. 

 Scales of involucre scarious and imbricated. 

 Receptacle chaffy. 



Heads small; involucre obovoid or campanulate; achenes 



flattened 19. Achillea 



Heads large; achenes terete. 20. Anthemis 



Heads solitary or corymbose. 

 Receptacles not chaffy. 



Ray flowers usually present, conspicuous 



21. Chrysanthemum 



Ray flowers inconspicuous 22. Tanacetum 



Heads small spicate or racemose paniculate. 23. Artemisia 

 Stj'le branches truncate or triangular with brush hairs. 

 Heads radiate or discoid. 

 Pappus of capillary bristles. Senecionideae. 



Heads showy, leaves opposite 24. Arnica 



Heads usually showy, leaves alternate. ...:.. .25. Senecio 

 Style branches short or united, anthers caudate. CynarEae 



Achenes basi-fixed 26. Arctium 



Involucral bracts pointed or prickly. 



Receptacle densely bristly 27. Cirsium 



Receptacle honey-combed 29. Silybiim 



Achenes attached laterally. 



Pappus of short scales 28. Centaurea 



LIGUUFLORAE 

 Herbs with milky juice. Corolla ligulate in all of the flowers of the head, 

 and all of the flowers perfect. 



1. Cichorium (Tourn.) L. Chicory 

 Erect branching perennial or biennial herbs with alternate leaves; involucre 

 of two series of herbaceous bracts, the inner of 9-10 scales, the outer of S 

 short spreading scales ; receptacle flat, naked or slightly fimbriate ; flowers bright 

 blue, purple or pink; rays S-toothed; Achenes striate; pappus of numerous 

 small chaffy scales forming a crown. 

 About 8 species of the old world. 



Cichorium Intybus L. Chicory or Succory 

 A branching perennial with deep, roots and alternate leaves ; basal leaves 

 spreading on the ground; stem leaves oblong or lanceolate, partly clasping. 



Distribution. Common along roadsides and in fields and waste places from 

 New England to Canada and Nebraska, especially where chicory has been culti- 

 vated. It has become a troublesome weed in Wisconsin and Minnesota. It is 

 allied to endive (Chicorium Bndivia), cultivated as a salad plant. 



