444 ON THE GENUS EUPHORBIA IN DE CANDOLLE’S PRODROMUS. 
serpyllifolia, maculata, corollata, dentata, heterophylla, and dictyosperma, though some of them 
are common only to the eastern, others more to the southern or western regions, and some [291] 
extend only to the edges of some of the floral districts: 8 species. 2. Species peculiar to the 
flora of the Northern and Middle States. I refer here a single species £. Geyeri, somewhat artificially 
it must be confessed, because it more properly belongs to the northwestern Prairie region; but thus 
far it has been found nowhere but in Northern Ilinoisand in Wisconsin: 1 species. 3. Species com- 
mon to Gray’s and Chapman’s district: 6 species. 4. Species peculiar to the southeastern flora: 8 
species. 5. Species common to the southeastern and the western flora: 3 species. 6. West Indian 
species extending into Florida: 4 species. 7. Species peculiar to the western and southwestern 
Prairie flora: 19 species. 8. Species common to the last and the following region: 3 species. 9. 
Species peculiar to the Mountain region of the west and southwest; many of these, as well as of 
section 7, undoubtedly extend into Mexico: 20 species. 10. Mexican species extending into the 
last region: 3 species. 11. Species common to the western Mountain region and the flora of the 
Pacific slope: 2 species. 12. Species peculiar to the Pacific slope: 3 species. 
GEOGRAPHICAL DISTRIBUTION OF EUPHORBI® WITHIN THE FLORA OF THE UNITED STATES. 
a d 26. Tithymalus. 
g E g oa F g 
s J 5 a — 4 
> =f 2, é a 5 g Ei < 
12+ € bea Pe 2 te te ; 
eee ee Oe ak ee Se ae aie ee 
|e ee ;alsel aye |e] ss] ale 
zt: oi os 3 3 S 3 -) 3 3 
1. Common to whole nied as 4 4 1 2 1 , 8 
2. Peculiarly northern 1 . _ es ve 1 
3. Northeast and cutee 2 ‘ 2 1 6 
I. Northeastern flora . . . . yi P a i 3 1 15 
1, Common to whole ae 4 v* 1 2 ne 1 ny 8 
3. Northeast and southeast . . 2 . . ua 1 2 1 6 
4. Peculiarly noe ry eee it ze sven 5 : . 3 o a 8 
5. Southeast and w PO eer OT 2 7 P : — ta ae 5 | 3 
G. From West Indies... . > 3 s ; : ‘ 1 ae as 4 
II. Southeastern flora . . DS | a a 6 2 2 5 3 2 29 
1, Common to whole — Sin seae ® 4 : ‘ 1 ‘ 2 1 ‘ 8 
5. ast and west . ye 2 : i ; j ay 2 1 3 
7. Peculiar to Prairie flora . . 8 1 1 2 1 : 5 i 2 3 19 
8. Prairie and Mountain flora . 3 ’ me 8 
111. Western Prairie flora . . re 1 i 3 2 2 : 3 3 4 33 
1. Common to whole country . . . 2 4 ‘ z : 2 vin 1 5 
8. Prairie and Mountain flora . 3 ie Z i fe s 2 
9. ———* _— ntain flora . 9 2 4 ae e2 3 1 ; 5 20 
10. From ese 1 ‘ ee ; 1 es ae ‘ 1 3 
Tk, iseatain ond Pacific flora 2 ‘ re =i ate 2 
IV. Western Mountain flora . . 17 2 2 : r 1 5 1 1 6 33 
1. Common to whole country . . . 2 . ‘ a - 1 ‘ 1 4 
11. Mountain and Pacific flora . . . 2 : ‘ . a iis iin ‘ roe . 2 
12. Peculiar to Pacifie flora eas 1 4 : 1 = ait ea 1 3 
V. Pacific flora . . ree 5 es - 1 1 ae 1 1 9 
Flora of the United States . . . 36 3 1 z 7 2 6 6 5 12 
Ssh Riv ehcerag ee SNe 
ee a Crna ed 
51 29 80 
