204 



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



1-15 cm long; sepals 0.2-0.5 cm long, widely spreading at maturity; petals white, 

 ca. twice as long as the sepals. Staminate flowers with divaricate to ascending 

 pedicels 1-3.5 cm long; stamens 7 or 9-15, the glabrous, subulate filaments 

 0.6-1.3 mm long, the oblong anthers 0.4-0.8 cm long. Mature pistillate heads 



0. 5-0.7 cm in diameter; achenes obovate, plump, 1.5-2 x 0.9-1.4 mm, the narrow 

 wings slightly crenate dorsally, the faces adorned with 1-3 crenate wings, the 

 subulate recurving beak 0.15-0.35 mm long, obliquely inserted. 



1. Phyllodia only 1-6 mm wide. 



2. Plant typically dwarf and tidal, if not tidal the phyllodes to 30 cm 



long, the floating ends often bladelike. 8a. var. subulata. 



2. Plant typically elongate, not tidal, the phyllodes more than 30 cm long, 



very narrow, the floating ends rarely bladelike. 8b. var. gracillima, 



1. Phyllodia 7-14 mm wide; typically all parts greatly enlarged throughout. 



8c. var. kurziana. 



8a. Sagittaria subulata var. subulata. 



A lis ma subu la turn L. Sp. PI. 343. 1753 



Sagittaria natans Michx. Fl. Bor.-Am. 190. 1803. 



Sagittaria pusilla Nutt. Gen. 2: 213. 1818. 



Sagittaria natans var. lorata Chapm. Fl. So. U.S. 499. 1860. 



Sagittaria subulata (L.) Buch. Abh. Nat. Ver. Brem. 2: 490. 1871. 



Sagittaria subulata var. natans (Michx.) J.G.Sm. Missouri Bot. Gard. Rep. 6: 18. 1894. 



Sagittaria filiformis J.G.Sm. Missouri Bot. Gard. Rep. 6: 20, p.p. 1894. 



Sagittaria natans var. pusilla (Nutt.) Chapm. Fl. So. U.S. ed. 3. 474. 1897. 



Sagittaria subulata vat, pusilla (Nutt.) Buch. Pflanzenreich 4(15): 58. 1903. 



Sagittaria lorata (Chapm.) Small, N.Am. Flora 17(1): 52, p.p. 1909. 



Sagittaria stagnorum Small, Man. SE. Fl. 24. 1933. 



Sagittaria subulata var. typica Fernald, Rhodora 42: 408. 1940. 



Sagittaria subulata var. lorata (Chapm.) Fernald, Rhodora 42: 409. 1940. 



Sagittaria subulata subsp. lorata (Chapm.) Clausen, Torreya 41: 161. 1941. 



Annual, or perennating by runners and corms. Tidal or submerged plant. The 

 submerged leaves modified into phyllodia 5-30 x 0.1-0.6 cm, the floating ends 

 occasionally dilated into ovate blades 2-6 x 0.8-2 cm, rarely cordate or sagittate. 

 Scape simple, 5-40 cm long, with 1-6 whorls of flowers. Bracts connate, the ends 

 caudate to 0.6 cm long, occasionally spathe-like, s carious-margined, evanescent. 

 Pistillate flowers with slightly thickened, recurved pedicels 1-3.5 cm long. Stam- 

 inate flowers with 7 or 9-12 stamens. Achene faces 1 (-3)-winged. (FIG. lOa-c.) 



Type collection: ex herb. Gronovii s.n., "Virginia" (holotype not seen, 

 British Museum, photograph of holotype, GH). 



Distribution: Coastal plain of eastern United States, from Massachusetts to 

 Alabama. Mostly in tidal waters, occasionally, especially southwards, in ponds 

 and other quiet waters. Collections examined from Alabama, Connecticut, Dela- 

 ware, District of Columbia, Florida, Georgia, Maryland, Massachusetts, New 

 Jersey, New York, North Carolina, Pennsylvania, South Carolina, Virginia. 

 (FIG. 10.) 



8b. Sagittaria subulata var. gracillima (S. Wats.) J.G.Sm. Mem. Torrey Club 5: 26. 

 1894. 



Sagittaria natans var. gracillima S. Wats, in A. Gray, Man. Bot. ed. 6, 556. 1890. 

 Sagittaria filiformis J.G.Sm. Missouri Bot. Gard. Rep. 6: 20,- p.p. 1894. 

 Sagittaria lorata Small, N.Am. Flora 17(1): 52, p.p. 1909. 



Perennial with runners. Leaves submerged, modified into phyllodia 30-9C 

 x 0.1-0.3 cm, the floating free ends rarely bladelike, to 3.5x0.5 cm. Scapes 

 30-90 cm long or longer, simple with 2-6 whorls of flowers. Bracts scarcely 

 connate, caudate-tipped to 1 cm long, soon evanescent. Pistillate flowers with 



