COMPOSITAE. 345 



Grenloc'h (He.), Clementon, Lindenwold CVP.)- 6fioMces«er— Miekleton 

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

 ^«anttc— Atlantic City (Te.), Absecon (Wn.). Ocea?i— Point Pleasant 

 (Br.), Seaside Park (Ha.), Forked Eiver (Ja.). Hw/iferdo/t— Rosemont 

 (C). 

 New CasfZe— East of Folly Woods. Rare. 



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



Summer and fall. 



£wcJt-s— Near Sellereville (Fr.). Montgomery— GlensiAQ (VP.). Dete- 

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

 Concord (W. Tr.), Williamson (Wn.). C/iesier— West Bradford Twp. 

 (St.). Lancaster — (P.). Berks — (P.). Lehigh — SaUsbury (Kr.). 

 Northampton — (F.). Dauphin— (P.). 



Cam (?e?i — Lindenwold (VP.). Giowcesier — Mullica Hill (C), near 

 Mickleton (He.), Swedesboro (Li.). /Saietn— Woodstown (Wa.). Ocean 

 —Forked River (Mac). Iferce/— Princeton, Trenton (C). 



New Cas^^e— Thompson's and elsewhere. Frequent. 



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



waste places. Summer. 



8. Carduus nutans L. Mush Thistle. M. p. 1033. Waste places and bal- 



last. Summer and fall. 

 Philadelphia— Greenv;iah Point (Te.). Da-itji'^i't— Harrisburg (Wn.). 

 Ca??!<?ei(— Kaighn's Point, /. Burl~ (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. 

 PMadeip/iia — Oakdale, Mart. (B. C), below Gray's Ferry (Wn.). 

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

 (Fu.). 



Ca-mde/( — 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 places. Summer. 



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

 Ave. (B. Sm.). 



