ENGELMANN—NORTH AM. SPECIES OP JUNCUS. 459 
R. Brown, J. Richardsonius , Roem. & Schult., J. pelocarpus, 
Gray Man. ed. 1, 507, in part, non Mey., J ’ articulatus , var. 
pelbcarpus , Gray Man. ed. 2, 482, in part; J. elongatus , Vasey, 
in herb.—This form ought, perhaps, not to be Separated from 
the last species, but with us it is easily distinguished, and oc¬ 
cupies a distinct geographical range; I, therefore, keep them 
apart for the present, and leave the final decision to the botan¬ 
ists of Europe, where both forms are much more abundant.— 
With us this species is confined to the northern and western 
parts of the continent, where it is usually found on the sandy 
or gravelly banks of lakes or streams; from Lake Champlain, 
Robbins , Macrae , and Seneca and Ontario lakes, Sartwell , 
where it meets the eastern, J. articulatus , northward to the 
Hudson Bay regions, Drummond and others, and the Arctic 
shores, and westward along the great Lakes to Detroit, Rige- 
low, Herb. norm. 51, northern Illinois, Vasey , and the upper 
Platte, Hayden, Colorado, Hall & Harb. 558, and beyond the 
Rocky Mountains toward Fort Colville, Lyall. 
Stems erect from a creeping rootstoek, 10-18 inches high; 
branches of the meagre panicle, at least in the larger speci¬ 
mens, strictly erect and much elongated, greenish and light 
brown; sepals oblong, obtuse, outer ones mucronate or cuspi¬ 
date, equal to, or exceeding, the rounded inner ones; stamens 
same as in last; ovary ovate, with a very short style; capsule 
as long as, or a little longer than, the sepals, obtuse, mucronate, 
incompletely three-celled; seeds very similar to last, but usu¬ 
ally more slender, oblanceolate and acute at both ends, rarely 
obtuse at the upper one, 0.30-0.35 line long.—The alpine form 
of this plant, the original type of Villars, is found in our Arc¬ 
tic regions, and is only a few inches high, bearing very few 
almost black heads, and has the slenderest and longest seeds. 
The ordinary American plant is distinguished from the usual 
European form by its lower stems, still stricter panicle, and 
paler flowers and fruit. Fries has sent absolutely the same 
from Sweden, formerly as J. sylvaticus, and as J. acutiflorus, 
and later as J. alpinus , var. insignis, which name may be re¬ 
tained for it. 
35. J. dubius, n. sp.: rhizomate crasso horizontali; caulibus 
(li-3-pedalibus) erectis cum foliis tereti-compressis; pa- 
nicula supradecomposita patula; capitulis pauci-(6-10)floris 
stramipeip; floribus subsessilibus; sepalis lanceolato-subulatis 
acutissimis sequalibus stamina six fere duplo superantibus; an- 
theris linearibus filamento sublongioribus ; capsula lineari- 
prismatica acutata uniloeulari exserta; seminibus obovatis 
utrumque apiculatis areis lineolatis reticulatis. 
Forming large tufts in wet granitic sand in Clark’s meadow, 
near the Big Tree Grove, Mariposa, California, at an altitude 
of 6,500 feet, H Rolander, fl. & fr. in July; Cal. State Surv., 
[April/1868.] 30 
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