22 
Juncaceae 
P. Panicle loose and wide-spreading when fully out; perianth and cap- 
sule pale-green. W. C. E. 
J. tenuis Willd. (Yard Rush) 
PP. Panicle glomerate or nearly so; perianth and capsule grayish 
brown. W. C. E. 
J. occidentalis Weis. 
OO. Capsule 3-celled; perianth-segments acute; panicle close, a turbinate 
cluster about 2.5 cm. long. E. 
J. confusus Cov. 
NN. Flowers not bracteolate, in true heads. 
Q. Leaf-sheath with auricles; perianth smooth. E. 
J. longistylis Torr. 
QQ. Leaf-sheath without auricles; perianth minutely roughened. 
R. Perianth longer than the capsule. 
S. Seed not tailed. 
T. Flowers in | or rarely 2—3 large heads. W. 
J. faleatus Mey. 
TT. Flowers in 3—20 small heads. C. E. (J. latifolius.) 
J. orthophyllus Cov. 
SS. Seed tailedtn Gor: 
J. regelij Buch. 
RR. Perianth shorter than the capsule. W. C. 
J. covillei Pip. 
II. Leaves with cross partitions; either flat and with the edge to the stem, or some- 
what terete; sometimes channeled. 
U.  Leaf-blade terete or only slightly compressed, sometimes channeled. 
V. Capsule subulate. 
W. Leaf-blades erect; flowers 3—4 mm. long, reddish-brown; petals 
equaling or exceeding the sepals. E. 
! J. nodosus L. (Knot Rush) 
WW. Leaf-blades spreading; flowers 4—5 mm. long, greenish or dull- 
brown; petals much shorter than the sepals. W. C. E. 
J. torreyi Cov. 
VV. Capsule not subulate, wider for its length. 
X. Capsule when mature at least 1'/2 times as long as the calyx. W. C. 
E. (Apparently J. oreganus.) 
J. castaneus Sm. (Chestnut Rush) 
XX. Capsule very little longer than the calyx, or shorter. 
Y. Stamens 3. 
Z. Capsule about as long as the perianth; filaments very little longer 
than the anthers; seeds acute at both ends. W. C. E. 
J. acuminatus Michx. (Pointed Rush) 
ZZ. Capsule shorter than the perianth; filaments several times as 
long as the anthers; seeds acute at base only. U. 
J. bolanderi Engelm. 
YY: -Stamens 6. 
a. Capsule obtuse or retuse. E. 
J. brachyphyllus Weis. 
aa. Capsule acuminate. 
b. Perianth-segments acute or obtuse; filaments much longer than 
the anthers; capsule longer than the perianth, acute or obtuse; seed 

