158 Rhodora [AuGusT 
Gr. Nat. Herb. no. 435; DeKalb, Aug. 8, 1914, O. P. Phelps, no. 
172; Selkirk, Oswego Co., Aug. 24, 1922, Fernald, Wiegand, & Eames, 
no. 14160. PnoviNcE or QuEBEC: Ste. Angele de Lavel, Nicolet Co., 
July 31, 1923, Chamberlain & Knowlton. Ontario: Russell, July 22, 
1911, John Macoun, no. 85843; Ottawa, Sept. 16, 1912, F. Fyles; 
Ottawa, Aug. 8, 1894, John Macoun, no. 7506. INDIANA: Miller, 
Aug. 20, 1913, H. H. Smith, no. 5772. 
le. Z. AQUATICA, var, interior, n. var., culmis 0.9-3 m. altis; foliis 
2-8 dm. longis 1-3 cm. latis, ligulis 1-1.5 em. longis; ramis femineis 
luxuriosissimis cum 11-29 spiculis, ramis masculis luxuriosissimis 
cum (20-)30-60 spiculis (hic Z. aquaticam simulantibus); lemmatibus 
femineis firmis nitentibus glabratis praeter margines nervosque et 
aristas (hic var. angustifoliam simulantibus). 
Culms 0.9-3 m. tall: leaves 2-8 dm. long, 1-3 em. broad; ligules 
1-1.5 em. long: lower pistillate branches with 11-29 spikelets; middle 
or lower staminate branches with (20-)30-60 spikelets (in these 
characters simulating typical Z. aquatica): pistillate lemmas firm, 
shining, glabrous except on the margins, nerves, and awns (in this 
character simulating var. angustifolia).'—Z. aquatica Lapham, Trans. 
Wise. State Agri. Soc. iii. 419, pl. ii. (1854).—Lake Michigan to North 
Dakota and Nebraska; Texas. INDIANA: Wolf Lake, Aug. 8, 1920, 
D. C. Peattie. IrurINotrñs: Bluff Lake, Union Co., Aug. 17, 1881, A. 
B. Seymour (in Herb. Wellesley College). Minnesota: Lake City, 
Aug. 20, 1883, W. H. Manning. Wisconsin: Brown Co., June, 1885, 
J. H. Schuette. Iowa: Ogden, Aug. 20, 1898, L. H. Pammel, no. 2147; 
Armstrong, Aug. 27, 1897, Pammel & Cratty, no. 764 (TYPE in Gray 
Herb.) Nesraska: Whitman, July 31, 1893, P. A. Rydberg, no. 
1630; Kennedy, Aug. 27, 1910, J. M. Bates. Texas: (no locality 
given) 1886-9, G. C. Nealley. 
2. Z. LATIFOLIA Turez. Bull. Soc. Nat. Mose. 1838, no. 1: 105 
(1838), and Cat. Baical.-Dahur. 21 (1838); Stapf, Kew Bull. 1909; 
385 (1909). Hydropyrum latifolium Griseb. in Ledeb. Fl. Ros. iv. 
466 (1853); Turcz. Bull. Soc. Nat. Mose. xxix. Pt. 1: 2 (1856) and Fl. 
Baical.-Dahur. ii. Pt. 1: 289 (1856); Maxim. Primitiae Fl. Amur. 
327 (1859); Regel, Tent. Fl. Ussuriensis, 171 (1861); Miq. Prol. 
Fl. Jap. 160 (1867); Franch. & Sav. Enum. Pl. Jap. ii. 156 (1879). 
Z. dahurica Turez. ex Steud. Syn. Pl. Gram. 4 (1854). Z. palustris 
Siebold, Syn. Pl. Econ. 10 (1830). Limnochloa cauduciflora "Turcz. 
in Trin. Mém. de l'Acad. de St. Pétersb. Sér. VI. v. Bot. 185 (1840), 
Reprint 19 (1839). Z. aquatica Benth. Journ. Linn. Soc. xix. 54 (1881) 
in part; Henry, Trans. Asiat. Soc. Jap. xxiv. Suppl. 107 (1896); . 
Hackel, Bull. Herb. Boiss. ser. 1, vii. 646 (1899) and ser. 2, iii. 502 
1See Brown & Scofield, Bull. no. 50 of the Bur. Pl. Ind. (1903). Plate V of this 
bulletin shows this plant and typical Z. aquatica. The difference in spread of the 
panicle of the two phases, here stressed, is not constant in the collection at the Gray 
Herbarium, but in this plate the spikelets of the plant in Fig. 2 may be seen to be 
decidedly thicker than in that of Fig. 1. Plate IV, Fig. 1, and Plate VII, C, show 
the spikelets of var. interior. 
