ENGELMANN—NORTH AM. SPECIES OF JUNCUS. 447 
bus; spatha paniculam simplicissimam (1-3-floram) superante; 
sepalis lanceolato-subulatis, exterioribus longioribus aristatis 
stamina 6 ter superantibus; antheris linearibus filamento bis 
terve longioribus; stigmatibus ovarium lineari-prismaticum 
in stylum attenuatum vix zquantibus inclusis; capsula pris- 
matica acutata exserta triloculari; seminibus oblongis tenui- 
ter striato-costatis longe caudatis.—J. arcticus, var. gracilis ? 
Gray in Pl. Parry, p. 34, and in Pl]. Hall. & Harb. 1. c.gex parte. 
On the western and north-western mountains; Dr. C. C. 
Parry, the indefatigable explorer of those mountain regions, 
who has been so often mentioned in the pages of these 
Transactions, and for whom I have named this interesting 
little plant, discovered it in Colorado in 1861 (coll. No. 360); 
Messrs. Hall & Harbour tound it in the same region (No. 
561), Dr. Hillebrand in the Sierra Nevada, and Dr. Lyall in 
the Cascade Mountains; it is generally, as it seems, associa- 
ted with J. Drummondii.cStems very thin and wiry, 4-8 
inches high, leaves one-half to two-thirds as long, deeply 
grooved for over half their length, terete upwards; spathe 
usually overtopping the flowers, often 1 inch or more long; 
flowers mostly two, very rarely three in number, 23-33 lines 
long, larger than those of the two last species, and dis- 
tinguished by their bristle-pointed exterior sepals, which are 
greenish, with brown sides and white margin, and strongly 
nerved. After maturity the placente of the slender and 
very acute brown capsule become detached from the valves 
and persist in the center. The whole seed is about 1 line, 
and the body alone about 0.4 line long; longitudinal ribs 10- 
12 on one side, cross-lines very faint. A Californian speci- 
men before me has somewhat shorter capsules and smaller 
and thicker seeds, but shows no other difference. 
16. J. rriripus, Linn., apparently a rare plant in North 
America; thus far found only on the highest mountains in 
New York, New Hampshire, and Maine, and in Newfound- 
land and Greenland.—American specimens do not differ from 
those of Europe. The seeds are few and large, irregularly 
compressed, very faintly striate, with very short appendages ; 
0.7-0.8, or even as much as 1.1 lines long, and 0.3 line or 
more in diameter. 
17. J. sretumis, Linn.: the only American localities known 
to me are those given by Hooker (FI. Bor. Am. 2, 192)—“Are- 
tic sea coast and islands, Rocky Mountains north of Smoking 
River, and Behring’s Straits.” A specimen from the Arctic 
sea coast, which I had the opportunity of examining, does 
not differ in any respect from the Norway and Lapland plant. 
The body of the seed is ovate-oblong, 0.34-0.42 line, and 
with the appendages ().66—-0.72 line, long; these are equal to, 
or shorter than, the diameter of the seed. In a Scotch speci- 
