92 FLORA OF WASHINGTON AND VICINITY. 



tLeucanthemum vulgare, L. [Chrysanthemum, Benth. «feHook., Gen. PI.] Ox-BYB 

 Daisy. White-weed. 

 May, June. ^ ^ 



V '- ' ■ '^J ' ' ' ' 

 t Arnica nudicaulis, Ell. Leopakd's Bane. 



Late in May or early in June. Rather rare. 



tErechthites hieracifolia, Raf. Fire-weed. 

 September. 



tSenecio aureus, L. Golden Ragwort. Squaw- weed. 



Young leaves glabrous, round kidney-shaped, and purple beneath. Alluvial and 

 sandy bottoms. April 1 to May 15. 



tSenecio aureus, L., var. Balsamitae, Gray. 



This is the upland form, and flowers nearly a month later. It seems to be a dis- 

 tinct species. June. 



tCacalia suaveolens, L. [Senecio, Benth. & Hook., Gen. PI.] Sweet-scented 

 Indian Plantain. 

 August to October. 



t Cacalia reniformis, Muhl. Great Indian Plantain. 

 High Island; rare. June. 



Cacalia atriplicifolia, L. Pale Indian Plantain. 



August. 



t Lappa oj^fciwoKs, Allioni. [^rciiwwi, Benth. & Hook., Gen. PI. ] Burdock. 

 July. 



t Cnicus ?awceoZa<M8, Gray. [Cimitm ianceote^wm, Scop.]. Common Thistle. Buii- 

 Thistle. 

 July. 



tCnicus discolor, Gray. [Cirsium diacolor, Spreng.]. 

 July, August. 



Cnicus altissimus, Gray. ICirsium altissimum, Spreng.]. 

 June to September. 



Cnicus arvensis, Gray. [Cirsium arvense, Scoi^.'\. Canada Thistle. 

 Waste places in the city. July, August. 



Onopordon acanthium, L. Cotton-Thistle. Scotch Thistle. 

 Formerly found in Washington ; abundant in Alexandria. June. 



Centaurea Cyanus, L. Bluebottle. 



K Street, S. E., over the B. & P. R. R. tunnel. Escaped. June. 



Centaurea CalcUrapa, L. Star-Thistle. 



Less common than formerly in Washington ; still abundant in Alexandria. Said 

 to have been brought hero during the war. July. 



Cichorium Intybus, L. Chiccory. 

 June to August. 



