56 NORTH AMERICAN FLORA [VoLumE 17 
achenes cuneate, 1.5 mm. long, winged, with one facial wing or crest, the beak short, 
lateral, spreading. 
TYPE LocaLity : Canada. 
DISTRIBUTION: Newfoundland to Saskatchewan, Florida, and Tex 
ILLUSTRATIONS: Rep. Mo. Bot. Gard. 6: p/. 19; Britt. & Brown, Ti. “AI. J. 204; Engler, Pflan- 
zenreich 445: 7. 78. 
14. Sagittaria Chapmanii (J. G. Smith) C. Mohr, Bull. Torrey 
Club 24: 20. 1897. 
Sagittaria graminea Chapmanii J. G. Smith, Rep. Mo. Bot. Gard. 6: 52. 1894. 
Plants usually emersed, 3-9 dm. tall; leaves various, often partially represented by flat 
phyllodia usually 10-30 cm. long, the blades linear or lanceolate, 15-20 cm. long, acute, 
usually much shorter than the petioles; scapes erect or assurgent, usually branched ; whorls 
of the inflorescence often numerous ; pedicels spreading or ascending, those of the pistillate 
heads 1.5-3 cm. long; bracts lanceolate, 6-12 mm. long, acute or acuminate, slightly united 
at the base; sepals ovate or oblong-ovate, becoming 4.5-5.5 mm. long; corolla mostly 1-2 
cm, broad; filaments dilated, pubescent ; anthers as long as the filaments or nearly so; 
fruit-heads about 5 mm. in diameter; achenes cuneate, about 1 mm. long, wingless, the 
beak short, lateral and above the middle of the body. 
TYPE LOCALITY: West Florida. 
DISTRIBUTION: Georgia, Florida, and Alabama. 
ILLUSTRATION: Rep. Mo. Bot. Gard. 6: pl. 21. 
‘15. Sagittaria papillosa’ Buch. Abh. Nat. Ver. 
Bremen 2: 44. 1869. 
Sagitiaria lancifolia papillosa Micheli, in DC. Monog. Phan. 3: 74. 1881. 
Plants mostly emersed, 3-10 dm. tall; leaves erect or. nearly so, the blades linear or 
linear-lanceolate, 10-15 cm. long, acute, as long as the petioles or shorter ; scapes usually 
longer than the leaves, mostly branched ; whorls of the inflorescence three to ten or more, 
the lower ones remote; pedicels of pistillate flowers 1-1.5 cm. long; bracts ovate, 3-4 mm. 
long, densely granular-papillose, united to about the middle; sepals ovate, roughened like 
the bracts, becoming 5-6 mm. long; corollas 2-3 cm. broad; filaments not dilated, gla- 
brous ; fruit-heads subglobose, 6-10 mm. in diameter; achenes cuneate, about 1.5 mm. 
long, the beak lateral and slightly above the middle of the achene-body. 
TYPE LOCALITY: Not given [Texas]. ? 
DISTRIBUTION: Louisiana and Texas. 
ILLUSTRATION: Rep. Mo. Bot. Gard. 6: pl. 25. 
16. Sagittaria ambigua J. G. Smith, Rep. Mo. Bot. 
Gard. 6: 48. 1894, 
Plants mostly emersed, 3-8 dm. tall; leaves erect, the blades lanceolate, 12-50 cm. 
long, 5-nerved, shorter than the petioles; scapes as long as the leaves or surpassing them, 
simple; whorls of the inflorescence rather numerous, commonly 8-15; pedicels mostly 
ascending, those of the pistillate flowers longer than those of the staminate ; bracts lanceolate, 
10-15 mm. long, united at the base; sepals oblong or nearly so, becoming 6-8 mm. long; 
filaments not dilated, glabrous; anthers shorter than the filaments; fruit-heads 12-15 mm. 
in diameter; achenes oblong, slightly curved, 2 mm. long, narrowly winged, each pro- 
longed into a short horizontal beak at the top. 
TYPE LocaLity: Oklahoma. 
DISTRIBUTION: Kansas and Oklahoma. 
ILLUSTRATIONS: Rep. Mo. Bot. Gard. 6: p/. 77; Britt. & Brown, Ill. Fl. f. 799; Engler, Pflan- 
zenreich 45: f. 16, £, F (fruit). 
17. Sagittaria falcata Pursh, Fl. Am. Sept. 397. 1814. 
Sagittaria lancifolia falcata J. G. Smith, Mem. Torrey Club 5: 25. 1894. 
Plants emersed or partially submerged, 8-15 dm. tall; leaves erect or nearly so, the 
blades almost linear to elliptic, mostly 14 dm. long, often slightly acuminate, much shorter 
