WATER-PLANTAIN FAMILY. gI 
io. Sagittaria teres S. Wats. Slender Sagittaria. (Fig. 202.) 
Sagitiaria teres S. Wats. in A. Gray, Man. Ed. 6, 555. —_ 1890. 
Monoecious, glabrous, scape slender, erect, simple, 
6/-18’ long, bearing only 1-3 verticilsof flowers. Leaves 
usually reduced to elongated terete nodose phyllodia or 
some of them short and bract-like, one or two of the 
longer ones occasionally bearing a linear blade; bracts 
ovate, obtuse, about 144’ long, much shorter than the 
filiform fruiting pedicels which are longer than the ster- 
ile ones; flowers 6’’-8’’ broad; stamens about 12, their 
dilated filaments pubescent, shorter than the anthers; 
achene broadly obovate, 1’’ long, the ventral margin 
winged, the dorsal 7-11-crested, the sides bearing several 
crenate crests, the beak short, erect. . 
In ponds, Massachusetts to South Carolina. Aug.-Sept. 
11. Sagittaria cristata Engelm. Crested Sagittaria. (Fig. 203. ) 
Sagittaria cristata Engelm.; Arthur, Proc. Davenport 
Acad. 4:29. 1882. 
Monoeciouns, scape slender, erect, 1°-214° high, sim- 
ple, bearing 4 or 5 verticils of flowers at or above the 
surface of the water. Leaves long-petioled, spongy 
and rigid, reduced to slender phyllodia or bearing 
linear-lanceolate or elliptic blades 2’-4’ long and 
3//-12’’ wide ; bracts acute, 2’’—4’’ long, much shorter 
than the slender fertile pedicels; flowers 8//—10/” 
broad; stamens about 24; filaments dilated, pubescent, 
at least at the middle, longer than the anthers; achene 
obliquely obovate, the dorsal margin with a broad 
crenate wing, the ventral straight-winged, each side 
bearing 2 crenate crests, the beak short, oblique. 
In shallow water, Iowa and Minnesota. Phyllodia are 
commonly developed from the nodes of the rootstock. 
July—Aug. 
12. Sagittaria graminea Michx. Grass-leaved Sagittaria. (Fig. 204.) 
Sagitlaria graminea Michx. Fl. Bor. Am. 2:190. 1803. 
Monoecious or dioecious, glabrous, scape simple, erect, 
4’-2° tall. Leaves long-petioled, the blades linear, lanceo- 
late or elliptic, acute at both ends, 2’-6’ long, %4’/-3’’ wide, 
3-5-nerved, the nerves distinct to the base, some of them 
occasionally reduced to flattened phyllodia; bracts ovate, 
acute, 114//-3’’ long, much shorter than the slender or fili- 
form fruiting pedicels, connate to the middle or beyond ; 
flowers 4’’-6’’ broad; stamens about 18; filaments dilated, 
pubescent, longer than or equalling the anthers; achene 
obovate, 14’/-1’’ long, slightly wing-crested on the margins 
and ribbed on the sides, the beak very short. 
In mud or shallow water, Newfoundland to Ontario and South 
Dakota, south to Florida and Texas. Early leaves often purplish. 
July-Sept. 
