447 
Group Il. GrENUINT Buch. 
Flowers prophyllate, inserted singly on the branches of the inflores- 
cence; leaf-blades, when present, and lowest involucral bract terete or 
slightly compressed, not channeled, not septate. 
5. J. effusus L. Sp. Pl. i, 326 (1753), Plant 50 to 120 em. high, densely tufted, erect : 
basal leaf-blades all reduced to filiform rudiments afew millimeters long: inflorescence 
2 to 10 em. high, occasionally congested to a smaller size; its leaf erect, appearing 
like a continuation of the stem, 5 to 25 em, long: perianth 2 to 3 mm. long, its parts 
lanceolate, acuminate: stamens 3, persisting in the fruiting perianth; the anthers 
shorter than the filaments: capsule obovate, 3-celled, regularly dehiscent: seed as de- 
scribed under J. tenuis. —Contined principally to the humid region of eastern Texas. 
Group III. THALLAssicr Buch. 
Flowers aprophyllate, inserted in heads on the branches of the 
inflorescence; leaf-blades as in group II. 
6. J. Reemerianus Scheele, Linnea, xxii, 348 (1849). Plant 50 to 120 em, high: 
stems erect, arising singly from a tough, scaly, horizontal rootstock 5 to 10 mm. thick: 
sheaths all basal and bearing erect blades exactly resembling the stem and of about the 
same length: inflorescence appearing lateral, 6 to 15 cm. high, diffuse, its leaf 10 to 
25 cm. long: heads 2 to 6-flowered: perianth 2 to 3.5 mm. long, the parts linear- 
oblong, outer acuminate, inner shorter and bluntly acute: flowers usually diwcious: 
stamens 6, on fertile plants reduced to sterile staminodia: capsule brown, about as 
long as the perianth, narrowly obovate, obtuse or truncate, mucronate, 3-celled ; 
placenta very thick and spongy, about one-third as broad as the valve.—The only 
species with diwcious flowers. Along the Gulf coast, within the influence of salt 
water, 
Group IV. Sepratr Buch, 
Flowers aprophyllate, inserted in heads on the branches of the inflo- 
rescence; leaf-blades terete, laterally compressed, or iridaceous, septate. 
* Leaves vertically flattened, imperfectly septate. 
7. J. xiphioides montanus Engelm, Trans, St, Louis Acad. ii, 482 (1868). Plant 
erect, 20 to 50 em. high: stems compressed, arising at intervals of one or a few cen- 
timeters from a scaly rootstock: leaf-sheaths compressed, with conspicuous mem- 
branaceous margins; blades vertically flattened, 1.5 to 3 mm. broad, seldom exceed- 
ing 10 em. in length, the septa incomplete; cauline leaves 2 to 4, similar to the 
others: inflorescence rarely 10 em. long: heads 3 to 10-flowered: perianth brown 
2.5 to 3 mm. long, the parts lanceolate, acute, with green midrib: stamens 6; the 
anthers usually exceeding the filaments: capsule equaling the perianth, oblong to 
narrowly oblong, or broadly acute, mucronate, 1-celled, the placent# strictly pa- 
rietal: seed 0.4 to 0.5 mm. in length, narrowly oblong, obliquely apiculate, conspic- 
uously reticulated in about 16 longitudinal rows, the areole nearly isodiametrical, 
and transversely linecolate.—Mountains of western Texas. 
8. J. Engelmanni Buch. Krit. Verz. Junc. 67 (1880). Plant about 1 meter high: 
stem stout, compressed, 2 to 4-leaved: leaves 50 cm. or less in length, the upper 
shorter; blades vertically flattened, 3 to 8 mm. broad, the septa incomplete: inflo- 
rescence 8 to 30 em. high, its leaves with nearly obsolete blades: heads globose, 7 to 
10 mm. in diameter, 20 to 100-flowered; perianth 3 to 4 mm, long, its parts subulate: 
stamens 3, one-half to three-fourths as long as the perianth; the anthers shorter than 
