ENGELMANN — NORTH AM. SPECIES OP JUNCUS. 447 



bus; spatha paniculam simplicissimam (1-3-floram) superanto; 

 sepalis lanceolato-subulatis, exterioribua longioribua aristatis 

 stamina 6 ter superantibus ; antheris linearibus filamento bis 

 terve longioribus; stigmatibus ovarium lineari-prismaticum 

 in stylum attenuatum vix seqaantibus 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 PI. Hall. & Harb. 1 c, ex parte. 

 On tbe western and nortb-western mountains ; Dr. C. C. 

 Parry, tbe 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 found it in the same region (No. 

 561), Dr. Ilillebrand in the Sierra Nevada, and Dr. Lyall in 

 the Cascade Mountains ; it is generally, as it seems, associa- 

 ted with J. Drummondii. — Stems 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, 2^-35 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 placentae 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, ci - oss-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. trifidus, 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. biglumis, Linn. : the only American localities known 

 to me are those given by Hooker (Fl. Bor. Am. 2, 192) — "Arc- 

 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 0.66-0.72 line, long; these are equal to, 

 or shorter than, tbe diameter of the seed. In a Scotch speci- 



