156 
placed in the genus in which it is now generally acknowledged 
a e stan 
s Ba the 
ee of Mexico seem 2 be as fav: eee nae its growth, at least 
arly 
coast hank of Florida. Its absence from the Gulf Coast may 
be occasioned by cold storms that sweep down through the 
eres Valley, ie there is ies ‘high land and no moun- 
tains to temper their icy winds as there are on the Atlantic 
seaboard. 
However, this well-marked north-south extension of range 
aes be the cecal a the passage of migratory birds plus one 
Penins our Hens is, and perhaps was 
foaneny, the center of tl f the cabbage- 
rees. e gen ee course e of flight of migratory birds is north 
and south, and not east an ird: have carried th 
able climate, until it reached the limit of endurance at Cape 
Hatteras. 
At Cape Hatteras the coast line turns to the northwest, and 
thus north of the Cape the shore has a northeastern exposure. 
For a history of the blue-stem, see Journal of the New York Botanical 
ee 23: 161-168. 1922. 
2? Bull. nue Club 28: 529. _ 1901, 
3 For S f the 
Pkeeieds see Journal of the New York Botanical Garden 23: 152. 1922. 
