FERNALD, — ELEOCHARIS OVATA. 495 
following stations in Marme:— St. Francis, Aug. 26, 1893, no. 2836; 
Masardis, where it passes to the species, Sept. 8, 1897, no. 2834; Island 
Falls, Aug. 28, 1897, no. 2835; Blanchard, Sept. 4, 1897, no. 2533; 
Great Works Meadow, Clifton, Sept. 22, 1898, no. 2772. Massacnv- 
serrs, bog, south of Annursnack Hill, Concord, Oct. 24, 1897 (2. F. Wil- 
liams) ; Winchester, Sept. 19, 1881 (C. E. Perkins) ; Dedham, Oct., 1878 
(Z. H. Hitchings) ; Sharon, Oct. 17, 1897 (2. F. Williams & J. M. Green- 
man). Also in Prussia (Lusatia & Silesia) where it is apparently rare. 
* * Bristles about equalling or shorter than the body of the achene, or 
obsolete or none. 
+ Tubercle nearly or quite as broad as the achene. 
+ Heads narrow-oblong or sub-cylindric; the blunt ascending scales 
close-app 
EB. Exceimannt, Steud. — Figs. 37 to 40. — Habitally resembling 
E. obtusa, the comparatively slender culms 1.5 to 3 dm. high: 
brownish, 5 to 15 mm. long, 2 to 3 mm. broad, very rarely compound : 
achenes similar to those of E. obtusa, but the flatter tubercle only about 
= fourth the height of the body of the achene: the bristles about equal- 
ling the achene and retrorsely barbed. — Syn. pt. 2, 795 Britton, Bull. 
| i Club, xv. 100. EB. ovata, var. Engelmanni, Britton, Jour. N. Y. 
lerose. Soc. v. 103. — A little known species originally collected by 
Dr. Engelmann in marshy places in the hills west of St. Louis, Sept., - 
1845; Texas ? (Mex. Bound. Surv. no. 1527); and later found at 
. Wethersfield, Connecticut (Chas. Wright), and on Pine Hill, Medford, 
ssachusetts, Aug. 19, 1880 (0. W. Swan). Better known in the 
Var. petonsa, Gray. — Figs. 30 to 36.— Generally a little stouter 
2 than the species: the bristles absent or represented only by their short 
| — bases. — Gray in Patterson, Cat. Pl. Ill. 46, & Bot. Gaz. ii. 
2 - £. obtusa 8, Torr. Ann. Lyc. Nat. Hist. N. Y. iii. 304. —— aah 
: ‘SACHUSETTSs, “Hills, Waltham” (B. D. Greene) ; Woburn, Oct., 1878 
, 
YANIA, damp sandy ground, Tinicum, Delaware County (A. H. Smith) : 
Micmican, Detroit (W. Boott): Ixp1ana, borders of ponds, Lafonte 
=p J. Hill) : ILtrvo1s, river bottoms, Oquawqua (7. N. Patterson): 
- Daxora, Bangor (Griffiths & Schlosser) : Nepraska, Fillmore Co. 
VW A Wibbe): Inpian Ternrrory, border of pond, Fort sil (CS. 
Sheldon, no. 256): Arizona, Grand Cafion of the Colorado (F. 4. 
