WATER-PLANTAIN FAMILY. 

 10. Sagittaria teres S. Wats. Slender Sagittaria. ( Fig. 202. ) 



agittaria teres S. Wats, in A. Gray, Man. lid. 6, 555. 1890. 



Monoecious, glabrous, scape slender, erect, simple, 



'-iS' long, bearing only 1-3 verticils of flowers. Leaves 



asually reduced to elongated terete nodose phyllodia or 



jme of them short and bract-like, one or two of the 



jnger ones occasionally bearing a linear blade ; bracts 



^ate, obtuse, about i^" long, much shorter than the 



liform fruiting pedicels which are longer than the ster- 



le ones ; flowers 6" -8" broad; stamens about 12, their 



lated filaments pubescent, shorter than the anthers ; 

 :heue broadly obovate, \" long, the ventral margin 

 inged, the dorsal y-n-crested, the sides bearing several 

 renate crests, the beak short, erect. 



In ponds, Massachusetts to South Carolina. Aug. -Sept. 



ii. Sagittaria cristata Engelm. Crested Sagittaria. (Fig. 2 



Sagittaria cristata Engelm.; Arthur, Proc. Davenport 



Acad. 4 : 29. 1882. 



Monoecious, scape slender, erect, i-i% 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 a'-4' long and 

 3 // -i2 // wide ; bracts acute, i"-\" long, much shorter 

 than the slender fertile pedicels ; flowers 8"-io" 

 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 ntvles of the rootstock. 



July-Aug. 



12. Sagittaria graminea Michx. Grass-leaved Sagittaria. \ Fig. 204. ) 



Sagittaria 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, #"-3" wide, 

 3-5-nerved, the nerves distinct to the base, some of them 

 occasionally reduced to flattened phyllodia ; bracts ovate, 

 acute, -i l /t"-5' f 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, X // ~ I// logi 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. 



