467 
rgins on the joint below, perianth of 6 to 9 downwardly barbed 
stles, 3 stamens, 2-cleft style, and flattened linear-oblong achene 
aked with the long persistent style. 
. D. arundinaceum (L.) Britton. Stem 3 to 6 dm. high: leaves short and flat, 
ear, 3-ranked. (Cyprus arundinacea L. D. spathaeeum Pers.)—Borders of ponds, 
oughout eastern North America and extending into Texas. 
4. ELEOCHARIS R. Br. (SPIKE-RUSH.) 
ueafless, with tufted stems sheathed at base and from matted or 
eping rootstocks, a single several to many-flowered spike terminating 
> naked stem, scales imbricated all round in many (rarely in 2 or 3) 
nks, perianth of 3 to 12 (commonly 6) bristles which are usually 
ugh or barbed downward and rarely obsolete, 2 or 3 stamens, 2 or 
left style, its bulbous base persistent as a tubercle jointed upon the 
ex of the lenticular or triangular achene. 
pike terete, scarcely thicker than the soft cellular stem: style 3-cleft: achene lenticular, 
pitted or wrinkled in longitudinal lines, 
. E. interstincta R. & 8. Stem terete, knotted as if jointed by many cross- 
rtitions, 6 to 12 dm. high: spike cylindrical, 2.5 to5 cm, long: scales round-ovate: 
stles 6 (rarely 7), firm or rigid, hisped: achene smooth, obscurely wrinkled, shin- 
r, with a sessile conical-beaked tubercle, (EF. equisetoides Torr.)—In shallow 
ter, throughout eastern United States and extending to the lower Rio Grande 
d western Texas. 
) EB. mutata R. & S. Like the last, but stem continuous and sharply 4-angled, 
d achene finely reticulated and with a conical flattened distinct tubercle. (Z. 
idrangulata R. & 8.)—Eastern United States, and extending through Texas to 
‘x1co. 
3 E.cellulosa Torr. Stem obscurely 3-angled below, terete above, 3 to 6 dm. 
rh: spike cylindrical, spirally twisted, 1.5 to 2.5 cm, long: scales round-obovate: 
istles rather rigid, nearly or quite smooth: achene conspicuously pitted, narrowed 
-o the conical (at length flattened) tubercle.—A marsh plant of the Gulf States, 
d extending through eastern Texas into Mexico. 
{. EB. elongata Chapm. Stems floating (6 to 9 din. long, all but the summit 
mersed), slender, terete: spike 12 to 20-flowered, acute, 12 to 18 mm. long: scales 
ther distant on the compressed rachis, oblong-ovate, green on the back, dark 
own on the sides: bristles 7, strongly bearded, rather longer than the obovate 
iticular or somewhat triangular faintly pitted achene; tubercle minute.—A Florida 
ecies, collected in Texas by Nealley. 
* * Spike thicker than the stem: style usually 2-cleft: achene lenticular. 
>. HE. atropurpurea Kunth. Stems tufted, erect (1.5 to 12.5 cm. high), 4-angled: 
ikes ovate or oblong, obtuse, at length very many (70 to 100)-flowered : scales oval, 
ry obtuse, thin, with brown sides and white margins: stamens 2: bristles none: 
hene very minute, pear-shaped, almost truncate, tipped with the somewhat peltate 
bercle. (E. multiflora Chapm.)—A tropical species, extending into Florida, Texas, 
id New Mexico, . 
6. B. capitata R. Br. Stem terete, 0.5 to 20 em. high or more: spike ovate to 
long, 2 to 6 mm. long, obtuse, 15 to40-tlowered : scales round-ovate, cbtuse, brown or 
ownish with green keel and paler margins: stamens 2: achene obovate, black, 
out equaling the 6 to 8 bristles, tipped with a flattened or saucer-shaped tubercle.— 
‘sand or gravel near sloughs, from the Gulf States through Texas to New Mexico 
1d Mexico. 
