232 O. A. STEVENS 
added to show whether the famiUes are better represented in the east or 
in the west. 
Table i. North American range of North Dakota plants 
I 
II 
III 
IV 
V 
VI 
Total 
N, E, 
U. S. 
R.Mt. 
Ranunculaceae 
2 
6 
4 
0 
16 
I 
29 
93 
89 
Brassicaceae 
2 
I 
4 
I 
15 
23 
46 
102 
133 
Scrophulariaceae 
2 
I 
2 
I 
15 
3 
24 
115 
121 
Boraginaceae 
0 
I 
3 
I 
5 
5 
15 
49 
67 
Lamiaceae 
4 
0 
I 
0 
12 
4 
21 
119 
28 
4 
4 
4 
5 
14 
I 
32 
214 
94 
6 
3 
7 
5 
20 
10 
51 
166 
201 
A steraceae 
25 
7 
19 
2 
53 
12 
118 
428 
463 
Liliales 
8 
3 
5 
0 
12 
I 
29 
174 
62 
Cyperaceae 
6 
2 
2 
I 
48 
0 
59 
333 
99 
18 
0 
10 
3 
64 
21 
116 
378 
206 
Total 
77 
28 
61 
19 
274 
81 
540 
Percent 
14 
5 
II 
4 
51 
15 
In table i, column I includes only the strictly eastern plants; such 
species as are found only in the eastern part of the state but occur in the 
western United States or Canada are placed in column V. Columns II 
and IV are similarly affected. Various difficulties arise in such a compila- 
tion, chiefly through incomplete records. The statements of distribution 
as given in the manuals are frequently insufficient, and original or detailed 
records must be consulted. For general distribution chief reliance has been 
placed upon the statements of Rydberg (11). 
The Western Plants 
These are quite conspicuous in early spring on the hills, where we find 
such plants as: Phlox Hoodii, Mertensia lanceolata, Viola Nuttallii, Orophaca 
caespitosa, Potentilla concinna, and Carex filifolia. In late spring and early 
summer are found: Paronychia sessiliflora, Eurotia lanata, Eriogynum flavum, 
E. muliiceps, Chamaerhodos erecta, Thermopsis rhombifolia, Astragalus 
pectinatus, Pentstemon cristatus, P. angustifoUus, and Oreocarya glomerata; 
on flats or gentle slopes below the hills, Musineon divaricatum and Lomatium 
foeniculaceum. On bare clay buttes in the "Bad Lands" and adjacent 
territory, Pachylophus caespitosus and Chrysothamnus graveolens are striking 
plants. The northern sides of many buttes are covered on the upper parts 
with Juniperus horizontalis , this being one of the plants which is absent in 
the eastern part of the state although it ranges to the Atlantic coast. Arte- 
misia cana is a conspicuous low shrub on the hillsides and flats below; this 
is the nearest approach to "sage-brush," as^. tridentata has been collected 
only at one point (Medora). 
Some species are reported only from the extreme western part of the 
state, such as: 
