156 Rhodora [AuGusT 
c. Plant 4-5.5 dm. tall: leaves 3-12 mm. broad; ligules 3 
mm. long: awn of the pistillate lemma 1-8 mm. long. . . . var. brevis. 
b. Pistillate lemmas firm and tough, with lustrous coarsely d 
corrugate surface, scabrous on the margins, at the sum- 
mit and along the awn, and sometimes along the nerves, 
otherwise glabrous: the aborted spikelets with distinct 
body 1.5-2 mm. thick d. 
late spikelets of nearly the same diameter.............. Z. latifolia. 
1. ZIZANIA aquatica L. Sp. Pl. ii. 991 (1753); Lamb. Linn. Trans. 
vii. 264, t. 13 (1804) ;! Nutt. Gen. N. Am. Pl. ii. 210 (1818); Elliott, 
Sketch of Bot. of S. C. & Ga. ii. 585 (1824); Chapman, Fl. Southern 
U. S. 549 (1860); Bentham, Journ. Linn. Soc. xix. 54 (1881) in part; 
Rendle, Journ. Linn. Soc. xxxvi. 345 (1904) in part; not Willd. Sp. 
Pl. iv. 394 (1805); nor Link, En. PI. ii. 391 (1822); nor Hitchcock, 
Contrib. U. S. Nat. Herb. xii. Pt. 3: 124 (1908) and in Gray, Manual, 
ed. 7: 120 (1908). Z. clavulosa Michx. Fl. Bor.-Am. i. 75 (1803); 
Willd. Sp. Pl. iv. 394 (1805). Hydropyrum esculentum Link, Hort. 
Berol. i. 252 (1827) in part; Kunth, Enum. i. 9 (1833) in part, and 
Suppl. 7, t. 1, fig. 1 (1835). Z. effusa Herb. L. ex Monro, Journ. Linn. 
Soc. vi. 52 (1862). Z. palustris Hitchcock, Contrib. U. S. Nat. Herb. 
xii. Pt. 3: 124 (1908) and in Gray, Manual, ed. 7: 120 (1908); not L. 
Mant. 295 (1771).—Mouths of rivers and in brackish places, along the 
Atlantic coast of North America from southern Maine to western 
Florida and probably Louisiana, inland in northern New York, and 
rarely in Michigan. 
The following representative specimens may be cited: MAINE: 
Woolwich, Sept. 15, 1916, Fernald & Long, no. 12581; Bowdoinham, 
Sept. 14 and 19, 1916, Fernald & Long, no. 12580. MASSACHUSETTS: 
Newbury, July 21, 1913, D. White, no. 214; Harwich, Aug. 7, 1919, 
Fernald & Long, no. 17904. New Yonk: Woodville, June 23, 1921, 
H. D. House, no. 8217; Hammond, July 28, 1915, O. P. Phelps, no. 
1371; Ithaca, Aug. 12, 1916, F. P. Metcalf, no. 5581; Glenmont, Sept. 
12, 1917, H. D. House; Sandy Creek Township, Aug. 25, 1922, Fernald, 
Wiegand, & Eames, no. 14161. New Jersey: Point Pleasant, 
1 The plate illustrates the broad-leaved plant. Lambert states on the authority of 
Smith that Linnaeus described it originally as Z. aquatica, but later called it Z. 
palustris, reserving the former name for Sloane's plant (which is Phragmites communis). 
2 Specimens in the Gray Herbarium and Herbarium of the New England Botani- 
cal Club unless otherwise noted. 
