330 COMPOSITAE 



37. HELENIUM L. 



Disk yellow : ray-flowers fruit-producing. i. H. autumnale. 



Disk purple-brown : ray-flowers neutral. 2. H. midiflorum. 



1. Helenium autumnale L. SneezEweed. Ox-eye. (Man.p. ioio; 

 I. V. f. jg^2.) In swamps and wet meadows, Quebec to Conn., Fla., S. 

 Dak., Kans. and Ala. — Pennsylvania: Northampton; Bucks; Dela- 

 ware ; Chester ; Lancaster ; Perry ; Dauphin ; Franklin ; Erie ; 

 Allegheny. 



2. Helenium nudiflorum Nutt. Purple Head Sneezeweed. (Man. 

 p. ioio; I. F. y. 3973.) In moist soil, Kans. to 111., Tex., east to Pa. 

 and Fla. — Petinsylvania : Philadelphia; Delaware. 



38. ACHILLEA L- 



1. Achillea Millefolium L- Yarrow. Milfoil. (Man. p. 1013; 

 I. F. y; 3983-) In various situations. Native of Eu. and Asia. — Pennsyl- 

 vania : Northampton ; Bucks ; Montgomery; Del-a.ware; Chester ; 

 Lancaster ; Franklin; Huntingdon ; Monroe ; Erie ; Allegheny. 



39. ANTHEMIS L. 



Ray-flowers neutral : plant glabrous or nearly so. i. A. Cotula. 



Ray-flowers pistillate : plants copiously pubescent. 2. A. arvensis. 



1. Anthemis Cotula L. Mayweed. (Man. p. 1014 ; I. F. y. 39S4.) 

 In fields and waste places, all over N. Am., except the extreme north. 

 Nat. from Eu. — Penjisylvania : Monroe ; Schuylkill ; Northamp- 

 ton ; Bucks; Delaware; Chester; Lanc^^ster ; Franklin; 

 Huntingdon ; Allegheny. 



2. Anthemis arvensis L. Corn or Field Camomile. (Man. p. 

 1014 ; I. F. f. 3gSj.) In fields and waste places, N. S. to Va., west to 

 Mich., Mo., and on the Pacific Coast. Nat. from Eu. — Pennsylvania: 

 Monroe ; Northampton ; Bucks ; Chester ; Lancaster ; Frank- 

 lin ; Erie. 



40. CHRYSANTHEMUM L. 

 Heads few or solitary : ligules of the raj^-flowers linear.' i. C. Leucanthemum. 

 Heads numerous, corymbose : Hgules of the raj'-flowers oval or obovate. 



2. C. Parthenium. 



1. Chrysanthemum Leucanthemum L. White or Ox-eye Daisy. 

 (Man. p. 1015 ; I. F. /". 39SS.) In meadows and waste places. Nat. 

 from Eu. — Pennsylvania: North.^mpton ; Bucks; DeL-'VWARE ; Ches- 

 ter ; Lancaster ; Franklin ; Tioga ; Allegheny. 



2. Chrysanthemum Parthenium (L. ) Pers. Common Feverfew. 

 (Man. p. 1015 ; I. F. /. 3990.) In waste places, N. B. and Ont. to N. J., 

 and locally in the interior, mostly escaped. Nat. or adv. from Eu. — 

 Pemtsylvania : Northampton ; Lancaster ; Monroe ; Allegheny. 



41. MATRICARIA L. 



Heads 16-25 mm. wide : ray-flowers present. i. M. Chamomilla. 



Heads 6-8 mm. wide : ray-flowers wanting. 2. M. matricarioides. 



1. Matricaria Chamomilla L. Wild or German Camomile. 

 (Man. p. 1016 ; I. F.y. 3994.) In waste places and on ballast, southern 

 N. Y. to Pa. Adv. or fugitive from Eu. — Pennsylvania : Philadelphia. 



