54 NORTH AMERICAN FLORA [VoLumE 71 
1,5-2 cm. long; bracts broad, 5-7 mm. long, united at the base; sepals ovate, 4-6 mm. 
long; corolla about 2cm. wide; filaments glabrous ; anthers oblong; fruit-head 12-14 mm. 
in diameter ; achenes broadly cuneate, about 2 mm. long, winged on both margins, the beak 
lateral, ascending, broadly triangular. 
TYPE LocaLiry : About Stockton, California. 
DISTRIBUTION : Lower San Joaquin River, California. 
ILLUSTRATION : Rep. Mo. Bot. Gard. 6: 2. 28. 
7. Sagittaria cristata Engelm.; Arthur, Proc. Davenport Acad. 
Sci. 4: 29. 1884. 
Plants wholly or partially submerged, 3-7.5 dm. tall; leaves various, the earlier ones 
stout, the linear-lanceolate phyllodia 8-15 cm. long, the later leaves several times longer than 
the phyllodia; blades linear-lanceolate to elliptic-lanceolate, 6-11 cm. long, 3-sided, much 
shorter than the petioles; scape elongate, commonly about as long as the leaves, simple ; 
whorls of the inflorescence 4-6, the lowest one with pistillate flowers; pedicels 1-3 cm. 
long; bracts 4-7 mm. long, distinct or nearly so; sepals ovate, becoming 5-7 mm. long; 
corolla about 2 cm. wide; filaments pubescent; anthers ovoid; fruit-head 15-20 mm. in 
diameter ; achenes cuneate-obovate, about 3 mm, long, with the dorsal margin undulate 
and the ventral margin straight, the two facial wings crested, the beak near the top of the 
achene-body, horizontal. : 
TYPE LOCALITY : Emmett County, Iowa. 
DISTRIBUTION : Minnesota and Iowa, and western New York (?). 
ILLUSTRATIONS: Rep. Mo. Bot. Gard. 6: Pl. 22; Britt. & Brown, Il. Fl. 7. 202. 
8. Sagittaria teres S. Wats. in A. Gray, Man. ed. 6. 555. 1890. 
Plants more or less submerged, 1.5-6.5 dm. tall; leaves usually represented by elon- 
gate, attenuate, nodose phyllodia, 10-60 cm. long, occasionally developing narrow imper- 
fect blades; scapes slender, 1-6 dm. tall, longer than the leaves; bracts ovate, 3 mm. long, 
obtuse; whorls of the inflorescence solitary or sometimes 3, 1 or 2 pedicels of the lower 
whorl bearing pistillate flowers, 10-25 mm. long, longer than those of staminate flowers; 
sepals ovate or oval, becoming 3 mm. long; corolla 12-15 mm. broad ; filaments dilated, 
pubescent, shorter than the anthers; anthers oblong; fruit-heads 8-12 mm. in diameter ; 
achenes oval or oval-obovate, 2 mm. long, with the dorsal margin undulate and the ven- 
tral one nearly straight, the several facial wings undulate, the beak stout, near the top of 
the achene-body, curved upward. 
TYPE LOCALITY: Massachusetts. 
DISTRIBUTION : Massachusetts to South Carolina. 
ILLUSTRATIONS: Rep. Mo. Bot. Gard. 6: pl. 24; Britt. & Brown, Ill. Fl. f. 202; Engler, Pflan- 
zenreich 45: f, 17. 
9. Sagittaria isoetiformis J. G. Smith, Rep. Mo. Bot. 
Gard. 6: 115. 1895. 
Plants more or less submerged, 1-3 dm. tall; leaves represented by terete, long and 
slenderly attenuate phyllodia, which occasionally develop thick, imperfect blades; scapes 
1-3 dm. tall, or rarely less, as long as the leaves or overtopping them; whorls of the in- 
florescence one to three; bracts ovate, 2-3 mm. long, acute, united below; pedicels of the 
pistillate flowers slender, 15-18 mm. long, those of the staminate flowers filiform, often 
longer than the former; sepals becoming 3-4 mm. long; corolla 12-15 mm. broad ; fila- 
ments ovate, pubescent, about as long as the anthers; anthers suborbicular; fruit-heads 
about 6 mm. in diameter; achenes obovate, 1.5 mm. long, with the dorsal and ventral 
margins ridged and several broad facial ridges, the short beak erect or oblique, near the top 
of the achene-body. 
TYPE LOCALITY: Eustis, Lake County, Florida. 
DISTRIBUTION : Georgia and Florida. 
ILLUSTRATION: Rep. Mo. Bot. Gard. 6: pl. 53. 
