43 



(38. Senecio.) 



aureus, var. obovatus, T. & G. 



Dry banks along Brandywine. Frequent. May. 

 aureus, var. Balsamitas, T & G. 



Serpentine banks; Dixon's. Rare elsewhere. June. 

 38*. Arnica, L. 



nudicaulis, Ell. 



Dry thickets; Townsend. Rare. June, 1860. 



39. Centaurea, L. 



Cyanus, L. (Blue Bonnets. Ragged Robin.) 

 Escaped from gardens; Brandywine, &c. July. 



40. Cnicus, Vaill. 



benedictus, L. (Blessed Thistle.) 



Almost naturalized near gardens, &c. July. 



41. Cirsium, Tourn. 



lanceolatum, Scop. (Thistle.) 



Pastures and roadsides. Common everywhere. June, 

 discolor, Spreng. 



Old fields and copses. Frequent. Aug. 

 altissimum, Spreng. 



Moist thickets, &c. Frequent. Au«\ 

 muticum, Miclix. (Swamp Thistle.) 



Swamps; Thompson's and elsewhere. Frequent. 

 Aug. 

 pumilum, Spreng. 



Low grounds in old fields, &c. Not common. July, 

 horridulum, Miclix. (Yellow Thistle.) 



Sandy places along Brandywine. Rare. July. 

 arvense, Scop. (Canada Thistle.) 



Vacant lots in Wilmington. Common. July. 



42. Lappa, Tourn. 



major, Gsertn. (Burdock.) 



AVaste places. Common. July. 



Sub-Order 2.— LIGULIFLOR^E. 



43. Cichorium, 1 Tourn. 



Inty^bus, L. (Cichory. Chicory.) 



Found by W. M. Canby near Green Hill Church. Au «-. 



1 Blanched leaves sometimes used as a salad, and the root for adulte- 

 rating coffee. 



