COMPOSITAE. 345 



Grenloch (He.), Clementon, Lindenwold (VP.). Gloucester— Miekleton 

 (He.), Swedesboro (Li.). Cape May— Cape May (He.), Wildwood (Ja.). 

 Atlantic— Atlantic City (Te.), Absecon (Wn.). Ocean— Point Pleasant 

 (Br.), Seaside Park (Ha.), Forked Kiver (Ja.). Hunterdon— Eosemont 

 (C). 

 New Castle— East of Polly Woods. Rare. 



6. Carduus muticus (Michx.) Pers. M. p. 1033. Swamps and low woods. 



Summer and fall. 



Bucks— Near Sellersville (Ft.). Montgomery— Glenside (VP.). Dela- 

 ware— Mineral Hill (He.), Valley of Darby Creek, Chrome Run (B. Sm.), 

 Concord (W. Tr.), Williamson (Wn.). Chester— West Bradford Twp. 

 (St.). Lancaster — (P.). Berks — (P.). Lehig h — Salisbury (Kr.). 

 Northampton— (P.) . Dauphin— (P.) . 



Camden — Lindenwold (VP.). Gloucester — Mullica Hill (C), near 

 Miekleton (He.), Swedesboro (Li.). Salem — Woodstown (Wa.). Ocean 

 — Forked River (Mac). Mercer— Princeton, Trenton (C). 



New Castle— Thompson's and elsewhere. Frequent. 



7. Carduus arvensis (L.) Robs. Canada Thistle. M. p. 1033. Fields and 



waste places. Summer. 



8. Cakduus nutans L. Musk Thistle. M. p. 1033. Waste places and bal- 



last. Summer and fall. 

 Philadelphia — Greenwich Point (Te.). Dauphin — Harrisburg (Wn.). 

 Camden — Kaighn's Point, I. Burk (He.) (Li.). 

 Carduus acanthoides. Ballast. Summer. 



Camden— Camden, I. Burk (He.). 

 Carduus pycnocephalus L. Ballast. Summer. 

 Camden — Kaighn's Point (Ja.). 



55. ONOPORDON L. 



1. Onopordon Acanthium L. Cotton or Scotch Thistle. M. p. 1034. 

 Waste places. Summer. 

 Philadelphia — Oakdale, Mart. (B. C), below Gray's Ferry (Wn.). 

 Delaware— Haverford (Wn.), shore of Delaware, Tinicum, Dr. Geo. Smith 

 (Fu.). 



Camden — Ballast (C). Ocean — Point Pleasant (Wn.). Mercer — 

 Trenton, Princeton (C). 



56. CENTAUREA L. 



Bracts of the involucre lacerate or fimbriate, not spiny. 



Annual; pappus about the length of the achene. 1. C. Cyanus. 



Perennials; pappus obsolete or short. 2. C. nigra. 



Bracts of the involucre tipped with stout, nearly simple spines. 



3. C. Calcitrapa. 



1. Centaurea Cyanus L. Bluebottle. M. p. 1035. Roadsides; escaped 



from cultivation. Summer. 



2. Centaurea nigra L. Knapweed. M. p. 1035. Waste pla-ees. Summer. 



Philadelphia— Fairmount Park on sides of Basin, 48th and Baltimore 

 Ave. (B. Sm.). 



