180 Rhodora [OCTOBER 
Pretz has extended the Pennsylvania distribution considerably north- 
ward in the local region. His collection is from the stone ballast of 
the Lehigh Valley Railroad near Slatington station. 
From a comparison of the most outlying stations it will be seen that 
we now know the species to be fairly well distributed about Phila- 
delphia over a radius of approximately sixty miles to the north, east, 
and west. The southernmost collection is at a distance of about 
thirty-five miles but there is every reason to believe that the plant 
occurs throughout southern New Jersey, and probably also consider- 
ably further south in Delaware than Delaware City. 
ACADEMY OF NATURAL SCIENCES OF PHILADELPHIA. 
PRICKLY LETTUCE. 
L. H. PAMMEL. 
In the fifth edition of Dr. Gray’s Manual of Botany, published in 
1868, this statement is made with reference to Prickly Lettuce (Lactuca 
Scariola) “Waste grounds and roadsides Cambridge, Mass., Adv. 
from Europe.” In a paper on the distribution of some weeds in the 
United States, etc., which I! published in 1891 the statement is made 
that it was first observed near Hovey’s Garden in 1863-64. In the 
next edition of Gray’s Manual by Watson and Coulter? the distribu- 
tion is given “waste grounds and roadsides, Atlantic states to Mis- 
souri and Minnesota.” In the next edition by Robinson and Fernald ê 
the L. Scariola L. is said to occur as follows; “roadsides, railway 
ballast, etc., s. N. E. to O., Mo., and Ky., chiefly westw.,” but even 
then less common than the following variety integrata Gren. & Godr. 
which is said to occur in “waste grounds and roadsides, across the 
continent; westw. an abundant and pernicious weed.” 
I have seen Prickly lettuce for a great many years. The plant so 
common in St. Louis in 1889, at Madison in 1883, La Crosse, Wiscon- 
sin, in 1886 and in Ames, Iowa, and elsewhere in Iowa in 1889 was the 
variety integrata. I saw the true L. Scariola common everywhere in 
California and the Salt Lake basin in 1898. 
During the past season I have observed the species abundant at the 
1 Proc, Ia, Acad. of Sci, 2: 109. 26th. Ed. 304, 1889. 3 7th ed. 866, 1908, 
