2955] 



REVISION OF THE GENUS SAGITTARIA 



209 



Perennial with corms and horizontal rhizomes. Emersed leaves with linear to 

 ovate blades, rarely cordate or with basal lobes, the occasional strap-shaped 

 phyllodia to 45 cm long and 1.5 cm wide. Scape simple, with 3-8 whorls of flowers. 

 Bracts strongly connate, 0.3-0.7 cm long the free ends obtuse. Pistillate flowers 

 with somewhat thickened recurved pedicels 1.5-3 cm long. Stamens 15-21, the 

 filaments 0.8-1.5 mm long, as long as or somewhat exceeding the anthers. Mature 

 receptacle 0.8-1.5 cm in diameter; achenes cuneate-obovate, 1.2-2 x 0.8-1.2 mm, 

 the faces with l(-3) slender wings, the subulate beak 0.3-0.6 mm long. 

 (FIG. lla-c.) 



Type collection: Lindheimer 713, Texas (lectotype MO; isolectotypes GH, 

 MO, NY, US). Engelmann did not cite any collections in his original description. 

 The selected lectotype is a specimen in Engelmann's herbarium so named by him 

 that is characteristic of the variety* 



Distribution: Southeastern Missouri, west to Kansas, south to Texas and 

 Alabama. A common plant especially in the Gulf States, in sloughs and swamps, 

 less common in small lakes and streams. Adventive in the Canal Zone since the 

 opening of the Panama Canal and apparently well established there. Collections 

 examined from Alabama, Arkansas, Kansas, Louisiana, Mississippi, Missouri, 

 Oklahoma and Texas in the United States and from the Canal Zone in Central 

 America. (FIG. 11.) 



10c. Sagittaria graminea var. teres (S. Wats.) Bogin, comb, no v. 

 Sagittaria teres S. Wats, in A. Gray, Man. Bot. ed. 6. 555. 1890. 



Perennial with runners and corms. Occasional emersed leaves with small 

 linear blades to 3 cm long and 0.5 cm wide, their petioles 20-50 cm long, the 

 typical spongy terete gradually tapering phyllodia 5=15 cm long. Scape with 2-4 

 whorls of flowers. Bracts fully connate, 0.2-0.3 cm long, the free ends minute, 

 obtuse or obsolete. Pedicels 1-3 cm long. Stamens 12-15, the filaments 0.7-1.2 

 mm long, as long as or slightly shorter than the anthers. Mature receptacle 0.6-1 

 cm in diameter; achenes obovate-cuneate, 2.0-2.5 X 1.2-1.5 mm, the dorsal wing 

 crenate, the faces with 1-3 prominent, crenate wings, the thickish beak 0.3-0.4 

 mm long, obliquely inserted. (FIG. lld-f.) 



Type collection: 8/21/88, Deane s.r\. ti Lewis Pond, Hyannis, Barnstable Co., 

 Massachusetts (lectotype GH). Watson cites this specimen and one collected by 

 E. S. Miller at Wading River, Long Island, N.Y., in his original description. The 

 Deane specimen characterizes the variety in every way and has been selected as 

 the lectotype. 



Distribution: Cape Cod to southern New Jersey. Sporadic in the acid waters 

 of lakes and bogs of the coastal plain. Often found in association with Sagittaria 

 engelmanniana and apparently locally abundant. Collections examined from Mas- 

 sachusetts, New York and New Jersey. (FIG. 11.) 



lOd. Sagittaria graminea var. weatherbiana (Fernald) Bogin, comb. nov. 

 Sagittaria weatherbiana Fernald, Rhodora 37: 387. 1935. 



Perennial with short thick rhizomes and runners. Emersed leaves with lanceo- 

 late to elliptical blades 10-25 x 2-8 cm, the strap-shaped phyllodia 10-20 x 1-2.5 

 cm, the petioles 15-50 cm long. Scapes 30-75 cm long, with 3-8 whorls of flowers. 

 Bracts moderately connate, 0.4-0.9 cm long, the free ends triangular. Pistillate 

 pedicels (2-)4-6.5 cm long. Stamens 12-18, the filaments 1-1.3 mm long, ca. the 

 same length as the anthers. Mature receptacle 0.7-1.2 cm in diameter; achenes 



