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MEMOIRS OF THE NEW YORK BOTANICAL GARDEN <[Vol. 9, No. 2 



3. Phyllodia strap-shaped, if terete, not markedly spongy; bracts not 

 fully connate. 



4. Phyllodes 1 cm or more wide; mature pistillate pedicels 4 cm or 



more long; southern coastal plains. 10d. var. weatherbiana. 



4. Phyllodes less than 1 cm wide; mature pistillate pedicels shorter. 



5. Filaments exceeding the anthers; western Great Lakes. 10e. var. cristata. 



5. Filaments shorter than or equaling the anthers. 



6. Achenes 2.5 mm or more long; highlands of North and South 



Carolina. 10g. var. macrocarpa, 



6. Achenes 2.0 mm or less long; throughout eastern North America. 



10a. var. graminea. 



10a. Sagittaria graminea var. graminea. 



Sagittaria acuti folia Pursh, Fl. Am. Sept. 2: 397. 1814. 

 Sagittaria simplex Torr. Comp. 356, p.p. 1826. 



Sagittaria sagittifolia var. simplex (Torr.) Hooker, Fl. Bor. Am. 2: 167. 1840. 

 Sagittaria purshii Kunth, Enum. PI. 3: 160. 1841. 



Sagittaria stolonifera Engelm. & Gray, Bost. Jour. Nat. Hist. 5: 234. 1847. 

 Sagittaria land folia L. var. angusti folia (Lindl.) Griseb. Cat. PI. Cuba 218, p.p. 

 1866. 



Sagittaria graminea var. cycloptera J.G.Sm. Missouri Bot. Gard. Rep. 6: 26. 1894. 



Sagittaria isoetiformis J.G.Sm. Missouri Bot. Gard. Rep. 6: 115. 1895. 



Sagittaria cycloptera (J.G.Sm.) Mohr, Bull. Torrey Club 24: 20. 1897. 



Sagittaria eatoni J.G.Sm. Missouri Bot. Gard. Rep. 11: 150. 1899. 



Sagitta graminea (Michx.) Nieuwl. Am. Midi. Nat. 3: 22. 1913. 



Sagittaria edwardsiana Clausen, Rhodora 39: 30. 1937. 



Sagittaria graminea subsp. edwardsiana Clausen, Torreya 39: 129. 1939. 



Annual, or perennial with corms or rhizomes. Emersed leaves with linear to 

 ovate blades, rarely with basal lobes, the variously thickened or strap-shaped 

 phyllodia to 40 cm long and 1 cm wide. Scape with 2-8 whorls of flowers. Bracts 

 moderately connate, the free ends 0.2-0.6 cm long. Pistillate flowers with ascend- 

 ing (rarely recurving) pedicels 1-3.5 cm long; petals white or pink. Stamens 12-°°, 

 the filaments 0.4-1 mm long. Mature receptacle 0.5-1 cm in diameter; achenes 

 obovate, 1.4-2 x 0.8-1.2 mm, the dorsal wing occasionally erose, the faces plain, 

 or with 1-2 narrow wings, the beaks 0.1-0.3 mm long, occasionally nearly obso- 

 lete. (FIG. I4a-c.) 



Type collection: Michaux s.n., *Canada' (holotype, not seen, in Herb. Michaux, 

 Paris; fragment of the holotype, MO). 



Distribution: Eastern North America from southern Labrador to Cuba, west- 

 ward to the Great Plains. Common over most of its range in diverse fresh water 

 habitats, but noticeably sporadic in the Appalachian Mountains and in the north- 

 west. The common tidal Sagittaria of the northeast but apparently absent in tidal 

 waters south of Virginia. Collections examined from Labrador, New Brunswick, 

 Newfoundland, Nova Scotia, Ontario and Quebec in Canada; from Alabama, Arkan- 

 sas, Connecticut, Delaware, Florida, Georgia, Indiana, Illinois, Iowa, Kansas, 

 Kentucky, Louisiana, Maine, Massachusetts, Michigan, Minnesota, Mississippi, 

 Missouri, Nebraska, New Hampshire, New Jersey, New York, North Carolina, 

 Ohio, Oklahoma, Pennsylvania, Rhode Island, South Carolina, South Dakota, 

 Tennessee, Texas, Vermont, Virginia, West Virginia, and Wisconsin in the United 

 States; from Cuba in the West Indies. (FIG. 14.) 



10b. Sagittaria graminea var. platyphylla Engelm. in A. Gray, Man. Bot. ed. 5. 

 494. 1867. 



Sagittaria recurva Engelm. ex Patterson, Checklist 130. 1887. Nomen nudum. 

 Sagittaria platyphylla (Engelm.) J.G.Sm. Missouri Bot. Gard. Rep. 6: 29. 1894. 

 Sagittaria mohrii J.G.Sm. in Mohr, Bull. Torrey Club 24: 19. 1897. 



