ENGELMANN—NORTH AM. SPECIES OF JUNCUS. 441 
e sepals from J. compressus, with both of which it vt sorely 
allied by the form of the stamens, so different from 
any other American or European Juncus of this se Bp oso 
science in Californ 
5. J. bepearenitcne Dethard. ap. Willd., is age characterized by 
its long and large anthers, which it has in common only with 
the two last mentioned species, and a terete stem and 
leafless vagine. Originally found on the shores of the Baltic, 
it has been traced to those of north-western Europe and to 
our north-eastern coasts from Newfoundland to Massachu- 
sylvania; all along the great lakes it is a common plant, not 
unexpected, to be sure, as ou their shores we meet with many 
other marine uch as Cakile, Lathyrus maritimus, 
waves of these immense bodies o water, is = at ever- 
varying sand name of the downs, which invites 
erg or are they the remnants of an Seasabosent vegetation 
ft from a period when the beds of these lakes were filled by 
an immense arm of the sea? Be that as it may, our species 
is not confined by the line of the lakes, but appears again 
on the upper Mississippi and St. Peters rivers, hence north- 
westward into the British possessions, and westward to 
ouri, and then southward along the Rocky Mountains to 
Decisis and New Mexico, and farther — ~ the Cascade 
Mountains in Oregon. e find it again as a true maritime 
e 
from the others that some will regard it as a distinet type. 
The different forms may be thus characterized : 
J. Balticus genuinus: caulibus tenuioribus rigidis — 4 
panicule laxioris ramis dichotomis ; ; floribus minoribus ; ca 
sula obtusa mucronata, seminibus grosse lineolatis. 
Var. a. Eu us: sepalis exterioribus acutioribus longio- 
ribus eesti late ovatam obtusam mucronulatam sube- 
quantibus ; antheris minoribus filamento duplo longioribus ; 
