445 
ANALYTICAL KEY TO THE SPECIES, 
Lowest leaf of the inflorescence terete, not channeled, erect, appearing like a 
continuation of the stem. 
Flowers sessile in heads on the ultimate branches of the inflorescence. 
J. RUEMERIANUS. 
l'lowers inserted singly on the branches of the inflorescence........-. J. EFFUSUS, 
Lowest leaf of the inflorescence not appearing like a continuation of the stem, or 
if so, channeled along the inner side, 
Leaf-blade transversely flattened (i. e., inserted with its flat surface facing the 
stem), or terete and channeled, not provided with node-like septa. 
Flowers inserted singly on the branches of the inflorescence, each with two 
opposite scarious bractlets at the apex of the pedicel. 
Annual....-. 2222-2. .----- 222-22 eee eee ee ee eee eee J. BUFONIUS. 
Perennials. 
Leaf-blade flat but sometimes involute in drying so as to appear terete. 
J. TENUIS. 
Leaf-blade terete, channeled along the upper side. 
Lowest involucral leat less than three times as long as the inflorescence. 
J. DICHOTOMUS. 
Lowest involucral leaf more than three times as long as the inflores- 
CONCE 222. eee nn ce ee ee ee eee eee eee J. SETACEUS. 
Flowers in heads on the branches of the inflorescence, without bractlets on their 
pedicels, 
Stem erect; capsule obovate. 
Perianth at least one-half longer than the capsule; anthers yellow, about 
0.5 mm. long. 22.22. .----2 eee eee cee eee eee eee eee J, FILIPENDULUS., 
Perianth equaling or barely exceeding the capsule; anthers reddish brown, 
about 1mm. lone. 
Inner perianth parts acute, often setigerous......J. MARGINATUS SETOSUS. 
Inner perianuth parts obtuse ...........----- J. MARGINATUS ARISTULATUS. 
Stem usually creeping, and rooting at the nodes; capsule narrowly linear- 
lanceolate... 22. ..2. 22.2.2 eee eee eee eee ee eee J. REPENS. 
Leaf-blade vertieally flattened (i. ¢., inserted with one margin toward the stem), 
or terete and not channeled, provided with node-like septa. 
Leaf-blade vertically flattened, with thin margins, the septa incomplete and situ- 
ated at irregular intervals. 
Heads (in the Texan plant) less than 10-flowered; stamens 6; capsule oblong, 
obtuse, mucronate. 2.2. .....222--.2---- J, XIPHIOIDES MONTANUS 
Heads more than 10-flowered; stamens 3; capsule linear-subulate, 
J. ENGELMANNI, 
Leaft-blade terete, or if somewhat compressed having obtuse margins, the septa 
passing entirely across the blade and situated at regular intervals. 
Stamens 6, i. e., one opposite cach perianth part. 
Outer perianth parts longer than the inner ....J. NODOSUS MEGACEPHALUS. 
Inner perianth parts longer than the outer -......---. J. NODOSUS TEXANUS. 
Stamens 3, i. e., none opposite the inner perianth parts. 
Capsule less than three-fourths as long as the perianth ..J. BRACHYCARPUS. 
Capsule more than three-fourths as long as the perianth. 
Capsule lanceolate-subulate, the body tapering gradually into a long 
subulate beak. 
Stamens as long as the perianth, the anthers visible at its mouth. 
. J. SCIRPOIDES. 
Stamens about one-half as long as the perianth, the anthers concealed 
within it........2-...-- wee eee eens eee ee eeees- J. CRASSIFOLIUS. 
Capsule oblong to linear-lanceolate, obtuse or acute, abruptly mucronate 
or apiculate. 
