FERNALD. ELEOCHARIS OVATA. 495 



following stations in Maine: — 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. 2833 ; 

 Great Works Meadow, Clifton, Sept. 22, 1898, no. 2772. Massachu- 

 setts, bog, south of Annursnack Hill, Concord, Oct. 24, 1897 {E. F. Wil- 

 liams) ; Winchester, Sept. 19, 1881 (C. K Perkins) ; Dedham, Oct., 1878 

 (E. H. Hitchings) ; Sharon, Oct. 17, 1897 {E. F. Williams & /. 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. 



-t- Tubercle nearly or quite as broad as the achene. 



++ Heads narrow-oblong or sub-cylindric ; the blunt ascending scales 

 close-appressed. 



E. Engelmanni, Steud. — Figs. 37 to 40. — Habitally resembling 

 E. obtnsa, the comparatively slender culms 1.5 to 3 dm. high: heads 

 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 

 one fourth the height of the body of the achene : the bristles about equal- 

 ling the achene and retrorsely barbed. — Syn. pt. 2, 79; Britton, Bull. 

 Torr. Club, xv. 100. E. ooata, var. Engehnanni, Britton, Jour. N. Y. 

 Microsc. 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, 

 Massachusetts, Aug. 19, 1880 (C. W. Swan), Better known in the 



Var. DETONSA, Gray. — Figs. 30 to 36. — Generally a little stouter 

 than the species : the bristles absent or represented only by their short 

 naked bases. — Gray in Patterson, Cat. PI. 111. 46, & Bot. Gaz. iii. 

 81. E. obtiisa /3, Torr. Ann. Lye. Nat. Hist. N. Y. iii. 304. — Mas- 

 sachusetts, " Hills, Waltham " (B. D. Greene) ; Woburn, Oct., 1878 

 {E. H. Hitchings, Thos. Morong) ; shores of Winter Pond, Winchester 

 ( W. Boott, E. H. Hitchings, C. W. J^fiiks & C. W. Sivan [a monstrous 

 form with capitate proliferous clusters], E. F. Williams, &c.) : Pennsyl- 

 vania, damp sandy ground, Tinicum, Delaware County (^4. // Smith) : 

 Michigan, Detroit ( W. Boott) : Indiana, borders of ponds, Lafonte 

 (E. J. Hill) : Illinois, river bottoms, Oquawqua (H. N. Patterson) : 

 S. Dakota, Bangor (Griffiths & Schlosser) : Nebraska, Fillmore Co. 

 (J. H. Wibbe): Indian Tekritort, border of pond. Fort Sill (C. S. 

 Sheldon, no. 256) : Arizona, Grand Caiion of the Colorado {F. H. 



