HARPER: DISTRIBUTION OF PLANTS OF THE COASTAL PLAIN 593 
his Manual if the southern boundary of his territory, instead of 
following the parallel of 36° 30’ all the way to the coast, turned 
northward in the longitude of Washington (77° W.) to the James 
River, and thence eastward to the coast; which would cut out an 
area about 50 miles square. This list of Dr. Gray's includes a 
few of the species now under consideration, but naturally does not 
give the evidence on which they were admitted to the flora of 
Virginia. 
In the following pages I shall have occasion to refer several 
times to Mr. Kearney’s table of the northern limits of nearly 500 
“‘austroriparian”’ (7. e., coastal plain) plants, published in his report 
on Dismal Swamp (Contr. U. S. Nat. Herb. 5: 450-457) in Igor, 
and shall not give the full citation each time. Although consider- 
ably less was known about the details of plant distribution in 
the southeastern states at that time than now, this was an excellent 
piece of work for its time, and it deserves to be extended and 
brought up to date. 
With very few exceptions all species of plants which reach 
their northern limits in any of the Atlantic states from New Jersey 
southward (excluding of course the local species of the southern 
Appalachian region) seem to be confined to the coastal plain in 
the northernmost state in which they are found.* As a rule such 
species seem to have their extreme northern outposts within a few 
miles of the coast, except in Virginia and northeastern North 
Carolina, where there are more southern plants west of Dismal 
Swamp than east of it, as I have previously intimated.f| The 
reason for all this is not very plain, but an understanding of it is 
perhaps not essential for present purposes. 
SENECIO TOMENTOSUS Michx. 
As in former years, t I saw this only within about fifty miles 
of Dismal Swamp, along railroads and in old fields and pastures. 
This time I noticed it only in North Carolina, first in Washington 
County, about 9 miles south of Plymouth, and last in Currituck 
County. 
*See Shreve, Plant Life of Maryland, 69-72, 76-85, 90, 94- 1910, 
{Torreya 9g: 225. 1909; Bull. Torrey Club 37: 420. I910. 
tSee Bull. Torrey Club 34: 367, 368. 1907; Torreya 9: 224. 1909. 
