778 REPORT OF NEW JERSEY STATE MUSEUM. 



Frequent in low, usually open ground, in the Northern and 

 Middle districts and rare in the lower Cape May peninsula. 

 Fl. — Early May to early June. 



Middle District. — New Eg>'pt, Delair, Birmingham (C), Camden (P), 

 Haddonfield (S), Lindenwold (S), Glassboro, Atco (C), Washington Park, 

 Mickleton, Swedesboro. 



Pine Barrens? — Cedar Lake (C). 



Cape May.— Cold Spring (OHB). 



CARDUUS L. 



Key to the Species. 



a. Bracts of the involucre more or less strongly prickly pointed. 

 b. Leaves tomentous beneath. 



c. All the bracts prickly pointed. [C lanceolatusY 



cc. Outer bracts only, prickly pointed. C. discolor, p. 778 



bb. Leaves green on both sides. C. pumilus, p. 778 



aa. Bracts not at all prickly pointed or scarcely so. 

 b. Heads large, few, 30-100 mm. broad. 



c. Heads closely subtended by the upper very spiny leaves, flowers 

 usually yellow. C. spinosissimns, p. 779 



cc. Heads peduncled, naked, flowers purple, involucre viscid. 



C. muticus, p. 779 

 bb. Heads small, numerous, 25 mm. broad or less. [C. arvensis]* 



Carduus discolor (Muhl.). Field Thistle. 



Cnicus discolor "Muhlenberg" Willdenow, Sp. PI. HL 1670. 1804 [North 

 America].— Barton, FI. Phila. H. 95. 1818.— Nuttall Gen. H. 1230. 1818. 

 Cnicus altissimus Britton 151. 

 Cirsium altissimum Knieskern 19. 



Common in swamps and meadows in the northern couniies 

 and rather frequent down the Coast Strip to Cape May, and 

 locally in the Middle district. 



Fl. — Mid-August to late September, occasionally into October. 



Middle District. — New Egypt, Lawnside (S), Riddleton. 



Coast Strip.— West Creek (S), Palermo, Seaville (S), Cold Spring (S). 



Carduus pumilus (Nutt.). Pasture Thistle. 



Cnicus pumilus Nuttall, Gen. H. 130. 1818 [New Jersey and New York]. 

 Cnicus odoratus Barton, Fl. Phila. H. 95. 1818. — Britton 151. 



^ Common Thistle a familiar weed. 



" Canada Thistle a bad weed, occurring in waste ground or locally in fields. 



