CATALOGUE OF PLANTS. 



49 



P. serpentaria, Pursh. 



Dry soil in open places, 

 casional. 



B *, common : — M* and S *, oc- 



TARAXACUM, Halter. Dandelion. 

 T. officinale, Web. Common Dandelion. 



Int. from Eu. into pastures, fields, and by roadsides every- 

 where. B, M*, S and B B, common. 

 T. erythrospermum, Andrz.f 



Native to Unalaska, etc., and int. into E. New England • 

 readily distinguished from T. officinale by its smaller, more 

 deeply cut leaves, smaller sulphur-yellow heads with fewer 

 flowers, the outer involucral bracts spreading or partly erect, 

 not reflexed, the akenes bright red or reddish brown and the 

 pappus a purer white. M*, among rocks in woods, Stoneham : 

 — B B*, occasional on rocks near The Falls. 



LACTUCA, Tourn. Lettuce. 

 L. Canadensis, L. Wild Lettuce. 



Rich soil, roadsides, clearings, and open woods. B and M 

 common : — S, occurs. 



L. integrifolia, Bigel. 



Open woods. US'*, rare; low ground. 

 L. hirsuta, Muhl. 



Dry open woods. B *, occasional ; by pool in Pine Tree 

 Brook, etc. : — M*, Virginia Wood, etc. 



SC ,% !'-;"'J£, L. ;.,ow Thistle. 

 S. oleraceus, L.- Common Sow Thistle. 



Nat. from Eu. in yards, gardens, and waste grounds. B*, 

 house-site. 

 S. asper, Vill. Spiny-leaved Sow Thistle. 



Nat. from Eu. in yards, gardens, and waste places. M, 

 abundant in field, W. of Bear Hill. 



t See Bot. Gaz. xs. 323. 



