Statistics of the Flora of the Northern States. 397 
plains. Its trees, where these occur, are principally some of 
to this district and its immediate borders, I may mention Jsopy- 
rum biternatum, Delphinium tricorne, Stylophorum diphyllum, Fy. 
bervcum spherocarpum and dolabriforme, Psoralea Onobrychis and 
stpulata, Gillenia stipulacea, Geum vernum, Gaura filipes, Lud- 
wigua polycarpa, Erigenia bulbosa, Solidago Shortii and rupestris, 
Monarda Bradburiana, Seymeria macrophylla, Lithospermum lati- 
Jolium, Phlox bifida, Gentiana puberula, Platanthera leucophea, 
ypripedium candidum, Trillium recurvatum and nivale, The 
only Grasses I know which are peculiar to the district, and not 
found east of the Alleghanies, are Poa sylvestris, Diarrhena Amer- 
tcana,—neither of them prairie-grasses,—and Lepturus panicula- 
4s, which mainly belongs to salt-licks and to the dry plains far- 
ther west. 
In fact,—looking at North American botany comprehensively, 
—this district cannot claim to be distinguished as a separate one, 
It is only a broad border along which the great naked plains of 
€ west and the eastern forest region meet and blend t 
the most diversified gradations. And so, likewise our south- 
eastern district is only a narrow extension of the botany of the 
Warm-temperate region of the Southern United States, prolonged 
northward upon the low coast, just as the botany of our cool- 
temperate region is prolonged southward along the Alleghanies. 
IV. The Alpine and Subalpine District has been sufficiently 
illustrated already (vol. 22, pp. 207, 230, vol. 23, p. 62). 
oh The Maritime District is inhabited by the following 60 
1€s, 
Ranunculus Cymbalaria. Honkenya peploides. 
_ Cakile Americana. #Spergularia rubra. 
_ Hudsonia tomentosa. Sesuvium Portulacastrum. 
‘Lechea thymifolia. *Hibiscus Moscheutos. 
