CATALOGUE OF PLANTS. 49 
P. serpentaria, Pursh. 
Dry soil in open places. B*, common: — M* and S*, oc- 
casional. 
TARAXACUM, Haller. DanpeELion. 
T. OFFICINALE, Web. Common DANDELION. 
Int. from Eu. into pastures, fields, and by roadsides every- 
where. B, M*, S and BB, common. 
T. ERYTHROSPERMUM, Andrz.t 
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. Lerruce. 
L. Canadensis, L. Wuitp LeEtTrvuce. 
Rich soil, roadsides, clearings, and open woods. Band M, 
common : — S, occurs. 
L. integrifolia, Bigel. 
Open woods. S*, rare; low ground. 
L. hirsuta, Muhl. 
Dry open woods. B*, occasional; by pool in Pine Tree 
Brook, etc. :— M*, Virginia Wood, etc. 
SONCHUS, L. Sow Tuistte. 
S. oLERACEUS, L. Common Sow THISTLE. 
Nat. from Eu. in yards, gardens, and waste grounds. 5b*, 
house-site. 
S. sper, Vill. Sprny-LeEAvED Sow THISTLE. 
Nat. from Eu. in yards, gardens, and waste places. MM, 
abundant in field, W. of Bear Hill. 
ft See Bot. Gaz. xx. 323. 
