ENGELMANN—NORTH AM. SPECIES OF JUNCUS. 49T 
Bigelow; 35 South Carolina, Bavenel; var. biflorus is a 
stouter plant with broader leaves, rough on the edges and a 
larger panicle; Hb. n. 38 Delaware, Commons ; 39 S. Caro¬ 
lina, Bavenel. Intermediate forms do not seem to be rare 
and are found in Hb. n. 36 and 37. Characters taken from 
the relative length of the inner and outer sepals, or from the 
differences in the shape of the capsule, seem to be entirely 
inconstant. Ho species bears more abundant seed than this, 
but in the collections it is rarely found fully mature. 
Pag. 455. J. pelocarpus; as far west as the banks of the 
St. Peters river, in Minnesota, C. C. Parry .—It seems that 
the plant attains its normal development, and bears fruit only 
in a northern climate, and grows then only 4-7 or 8 inches 
high, Massachusetts, Tuckerman in Hb. n. 45, while the pro¬ 
liferous forms usually become 1 or 2 feet high, Hew Jersey, 
Smith <& Leidy in Hb. n. 46; the interesting southern var. 
crassicaudex , Florida, Chapman , Hb. n. 47, is often 2 feet or 
more in height and bears a very large decompound panicle, 
5-9 and even 11 inches long. 
A specimen Of Michaux’s J. fluitans , from his own her¬ 
barium in Paris, bears me fully out in my supposition that it 
is a depauperate water or mud form of this species; its short, 
rooting stems, about 4 inches long, bear single terminal 2- 
flowered heads; the flower I could examine was not fully 
open yet, and leaves me in doubt whether it is 3- or 6-an- 
drous. The description of La Harpe is not quite correct in so 
far as he attributes to the head 2 external bracts; while they 
have 3 as the 2-flowered heads of the regular form have, one 
under each flower, and a third one above the upper flower. 
Michaux found his plant, as Prof. O. Brunet of Quebec in¬ 
forms me, on the Chicoutimi, about 100 miles north of Quebec. 
Pag. 458. J. articulatus, as far west as the shores of Lake 
Erie, G. W. Clinton; in Herb. norm. 48 from Western Hew 
York, Sartwell , and 49 from Massachusetts, Tuckerman .—A 
form with obtuse 5-flowered green heads in a spreading and 
often almost level-topped panicle, obtuse, mucronate sepals 
and obtuse short mucronate capsule, which I designate as 
var. obtusatus , has been found by Messrs. JDiffenbaugh and 
Burke on the river banks near Philadelphia; Hb. n. 50. 
INDEX. 
The names of the species are in Roman type, those of the synonyms in Italics. 
J. abortivus, Chapm.. 
acuminatus, Michx. 
acuminatus, Auct. Am. ..... 
acutiflorus, var. Benth. ■ • • • • 
acutus, Lin. • • .. 4381 
affinis, R. Br.. 
alpinus, Vill.. 
arcticus, Willd. . 445, 491 
arcticus, Hook.. 445 
arcticus , var. Gray. 446, 447 
aristatus , Pers... . 455 
aristulatus, Michx..455 
articulatus, Lin....... - 458, 497 
asper, Eng.. 478 
