36 VASCULAR PLANTS. 



50. Anthemis, L. 



Superflua. Kay-flowers ligulate. Scales of 

 the involucre imbricate. Receptacle convex or 

 conical, paleaceous. Akenes ribbed; pappus 0. 



. U . flowers white. 



51. Chrysanthemum, L. 



Superflua. Involucre hemispherical, spread- 

 ing; scales go -seriate, imbricate, appressed. 

 Receptacle not conical, naked. Akenes short, 

 somewhat terete, costate, truncate at the apex; 

 pappus 0. 



0.2]!. flowers white, yellow. 



52. Matricaria, L 



Superflua. iEquali-'. Scales of the involucre 

 imbricate. Receptacle conical, naked. Akenes 

 angulate; pappus coroniform or 0. 



0. flowers white. 



53. Tanacetum, L- 



iEqualis. Superflua. Ray-flowers not ligu- 

 late. Receptacle convex, naked. Akenes, 

 angulate, with large epigynous disk; pappus 

 coroniform or 0. 



It. flowers yellow. 



54 Artemisia, L. 



iEqualis. Superflua. Necessaria. Ray-flow- 

 ers tubular. Scales of the involucre dry, with 



