ENGELMANN—-NORTH AM. SPECIES OF JUNCUS. 437 
GEOGRAPHICAL DISTRIBUTION. 
Of the fifty species above enumerated, thirty-three, or 
two-thirds, are peculiar to our country, and seventeen, or 
ar e wor 
t 
these seventeen (J. effusus and bufonius) are eer 
species, which are found almost in all countries of our globe ; 
if our inet is once referred, to Chili. 
The different forms of J. Balticus, nodosus, and Canaden 
a third form, which is more generally distributed. 
None of the eight southern species are found anywhere 
else, and of the nine Pacific species only the two above men- 
tioned extend beyond our territory to other parts of America, 
adding another proof of the well known fact, that of all our 
Floras that of the southern and that of the Pacific States are 
the most peculiar and exclusive ones. 
From yc ee distribution our species may be 
iy 
a etke ‘whale country grow J. effusus, tenuis, bufoni- 
us, ‘ad: beta! s. Of these only the last one does not extend 
into other Floras. 
2. Over the bier country, with the exception of the 
western Plains and Mountains and the Pacific slope: J. 
' marginatus and pallescens, both peculiarly North American. 
3. Over the whole country with the sais ase of the great 
ppmer: valley and the Pacific region arpus and 
nadensis ; both only found in North ‘America. 
z Pt the great interior vow ih from Michigan to the Rio 
Grand Livah achycarpus, and, with more extensive an 
one of hs forms of fee ne (the var. megacephalus 
5. Northward—J. filiformis and the northern RON GSE of 
J. nodosus and Canadensis ; north-eastward—J. articulatus, 
