372 Pollard : The Gexus Achillea ik North America 



lo. Achillea ligustica All. Fl. Pedem. i: i8i,/. 52. / 2. 



1785. 



Plant robust and branching, pubescent or puberulent : leaves 

 coarsely bipinnatifid, the rachis broadly margined : segments com- 

 paratively few, ovate or oblong in outline, irregularly incised : 

 corymb rather slender, flat-topped : involucral bracts greenish, 

 carinate : rays white, 2-3 mm. in diameter : achenes linear, winji- 



This plant must be* added to our list of European waifs, two 

 specimens having been collected at Onteora, N. Y., in 1S91 by 

 Miss Anna Murray Vail. 

 Massachusetts coast. 



The plant has also been collected on the 



In conclusion, I wish to express my grateful acknowledgements 

 to Dr. N. L. Britton, Prof. L. M. Underwood and Dr. B. L. Rob- 

 inson for the loan of material, and to Prof Edward L. Greene for 

 the privilege of using his invaluable library. To Mr. William R. 

 Maxon, of the National Museum, I am also indebted for assistance 

 in many critical comparisons and verifications. 



