525 



Bidens Frondosa, L. — Burr Marigold ; troublesome in moist corn- 

 fields, and in cleared-up and cultivated swamps. 



Bidens Tripartita, L. — Trifid Burr Marigold or Beggar's Lice ; tick 

 seed, sheep ticks, ditches, swamps. 



Cnicus Arvensis, Willd. — Canada Thistle ; destroyed by mowing it 

 when it flowers. 



Cnicus Lanceolatus. — Common Thistle. 



Onopordon Acanthium, L. — Cotton Thistle ; waste grounds ; very 

 large in rich soils. 



Centourea Nigra, L. — Knap weed ; black thistle, troublesome in sto- 

 ny, rich soil : introduced. 



Chrysanthemum Leucanthemum, L. — Oxeye Daisy ; White Weed, 

 &c. Introduced. 



Cichorium Intybus, L. — Succory ; Middlesex county : introduced. 



Erigeron Integrifolium. — Rye Fields. 

 do. Canadense. do. 



Gnaphalium Polycephalum, Mx. — Sweet-scented Everlasting, 

 do. Margaritaceum, L. — Pearly Everlasting. 



Helianthus Tuberosus, L. — Artichoke ; gardens. Introduced. 



Inula Helenium, L. — Elecampane ; in clayey soils ; Essex Co. 



Senecio Vulgaris, L. — Groundsel ; in gardens. 



do. Hieracifolius, Mx. — Fire Weed ; on new-burnt land, spread- 

 ing with great rapidity by its downy seeds. 



Tanacetum Vulgare, L. — Tansey ; if neglected, grows in very dense 

 and troublesome patches. Introduced. 



Asclepias Syriaca, L. — Milk Weed ; road-sides ; young shoots used 

 for asparagus ; fibres of the stems spun for thread, and silky down of 

 seeds, in the ornamental work of capes. Several other species growing 

 in swamps. 



Convolvulus Arvensis; L. — do. Sepium, L. — do. Stans, Mx. — Morn- 

 ing Glory ; in fields and on stone walls ; the second species a great 

 creeper, with beautiful flowers. 



Antirrhinum Linaria, L. — Toad Flax ; a great pest in cultivated 

 fields, especially among wheat on rich stony land, and difficult to extir- 

 pate. 



Datura Stramonium, L. — Apple of Peru ; Thorn Apple ; sea-shore 

 and way-side, near rich compost heaps, and contiguous to barns. In- 

 troduced. Seeds a violent emetic, and whole plant dangerous. 



