Arctium COMPOSITAE Cirsium 



field 4 mi. w. n. w. of Easton (Ta), Earle, 3609, 27 July 1942 (A). 

 June to Aug. 



Carduus L. Plumeless Thistle. 



C. nutans L. Musk Thistle. 



One collection: cultivated ground l}4 mi. n. of Millington (Ke), 

 R. R. Tatnall, 3829, 7 June 1938 (T, G). 



Cirsium Hill. Thistle. 



C. vulgare (Savi) Airy-Shaw. (C lanceolatum of manuals.) Bull 

 Thistle. 



Infrequent, in fields and waste places of northern New Castle 

 County; rare, or seldom collected, southward: grassy slope 3 mi. n. e. 

 of Easton (Ta), Earle, 3484, 1 Sept. 1941 (P). Aug. to early Oct. 

 Nat. from Europe. 



C. horridulum Mx. (C. spinosissimum (Walt.) Scop.) Yellow 

 Thistle. 



Infrequent, in meadows and dune hollows, along the Fall Line, 

 and southward to Northampton County. Mid-May, June. 



C. discolor (Muhl.) Spreng. Field Thistle. 



Frequent in pastures, meadows and thickets, Piedmont area; 

 occasional on the Coastal Plain: thicket IJ^ mi. s. of Bohemia 

 Mills (Ce), R. R. Tatnall, 3493, 20 Aug. 1937 (T); meadow 3 mi. n. 

 of Easton (Ta), Earle, 3485, 1 Sept. 1941 (P, A). Mid-Aug., Sept. 



C. altissimum (L.) Spreng. Spineless Thistle. 



Infrequent; fields and woods in the valley of Red Clay Creek 

 (NC), and doubtless elsewhere. Late Aug., Sept. 



C. virginianum (L.) Mx. 



One collection: southeast of Georgetown (S), C. S. Williamson, 

 30 Aug. 1908 (A). 



C. muticum Mx. Swamp Thistle. 



Infrequent, in swamps and low thickets, on the Coastal Plain 

 area of New Castle and Cecil Counties. Mid-Aug. to early Oct. 



C. pumilum (Nutt.) Spreng. Pasture Thistle. 



Infrequent, in pastures of the Piedmont province. July. 



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