ParY 1, 1909] ALISMACEAE 53 
fully 2 cm. wide; fruit-heads 8-10 mm. in diameter; achenes rather numerous, 2-2.5 mm. 
long, with 5-7 prominently dentate or crenate crests, the ‘beak erect or decidedly curved 
upward. 
TYPE LOCALITY : Carolina. 
DISTRIBUTION : New Jersey and South Carolina to Florida; also in Massachusetts, Rhode 
ae Connecticut, and New Jersey, as far as the form described as S. natans gracillima is con- 
cerne 
ILLUSTRATIONS: Rep. Mo. Bot. Gard. 6: p2. 14; £1. 23, f. 5-8 (S: natans gracillima). 
3. Sagittaria filiformis J. G. Smith, Rep. Mo. Bot. 
Gard. 6: 46. 1895. 
Plants submerged, not greatly elongate; leaves mere bladeless phyllodia with slender 
or filiform tips from thicker bases, 1-6 dm. long or rarely as long as the scape; scapes 
slender, 6-12 dm. long, often branching from the lower whorls; bracts lanceolate, 3-5 mm. 
long, acuminate; pedicels slender or filiform, ‘those of the lower whorls 1-4 cm. long; 
whorls remote, the flowers staminate except 1 or 2 flowers of the lower whorl; sepals ovate, 
2-3 mm. long, obtuse; corolla white, about 2 cm. broad; fruit-heads 6-7 mm. in diameter ; 
achenes 1.5 mm. long, with about 6 crests, the beak lateral, upwardly curved. 
TYPE LOCALITY: Dog River, Mobile County, Alabama. 
DISTRIBUTION : Florida and Alabama ; apparently also in the Carolinas. 
ILLUSTRATION: Rep. Mo. Bot. Gard. 6: pl. 15, f. 5-8. 
4. Sagittaria platyphylia (Engelm.) J. G. Smith, Rep. Mo. Bot. 
Gard. 6: 55. 1895. 
Sagitiaria graminea platyphylia Engelm. in A. Gray, Man. ed. 5. 494. 1867. 
Plants emersed, erect; leaves mostly with blades, but these sometimes arcompanied by 
narrow phyllodia, the blades thick and rather leathery, lanceolate, elliptic, or ovate, 5-15 
cm. long, 5-7-nerved, acute or acuminate, gradually narrowed at the base or subcordate; 
scapes 2-5 dm. tall, usually overtopped by the leaves; whorls of the inflorescence 3-8, the 
2 or 4 lower ones pistillate; pedicels 1-2.5 cm. long; bracts broadly ovate, 3-8 mm. long, 
scarious-tipped ; sepals ovate or orbicular-ovate, becoming 4.5-6 mm. long; corolla 2.5-3 
cm. wide; filaments pubescent; anthers oblong; fruit-heads fully 1 cm. in diameter; 
achenes obliquely obovate, 2 mm. long, winged on both margins, the beak horizontal, 
rather long. 
TYPE LOCALITY: Not given. 
DISTRIBUTION : Missouri and Kansas to Alabama and Texas. 
ILLUSTRATIONS: Rep. Mo. Bot. Gard. 6: #/. 26; Britt. & Brown, Ill. Fl. f. 206. 
5. Sagittaria demersa J. G. Smith, Rep. Mo. Bot. Gard. 6: 58. 1895. 
Plants submerged, but not greatly elongate; leaves mere narrow phyllodia attenuate to 
the blunt apex from base 10-15 mm. in diameter; scapes usually 2-3 dm. long, simple, 
shorter than the leaves; whorls of the inflorescence 4-6, the lower one with pistillate 
flowers; pedicels 1-3.5 cm. long; bracts 3-5 mm. long, partially united ; sepals oblong to 
ovate, becoming 4-4.5 mm. long; corolla about 1.5 cm. wide; filaments glabrous; anthers 
suborbicular; fruit-head 5-6 mm. in diameter; achenes obovate, 1.5-2 mm. long, both 
margins winged, the beak lateral, erect, slender. 
TYPE LOCALITY : Near Guerrero, Chihuahua, Mexico. 
DISTRIBUTION: Chihuahua. 
ILLUSTRATION : Rep. Mo. Bot. Gard, 6: pl. 15, f. 4. 
6. Sagittaria Sanfordii Greene, Pittonia 2: 158. 1890. 
Plants emersed or partially submerged, erect or ascending ; leaves 9-15 dm. tall, some- 
times partially represented by 3-sided phyllodia, the petioles spongy, very stout, commonly 
2-4 em. thick at the base, the blades linear-lanceolate to oblong-lanceolate, mostly 10-15 
cm. long, acute, narrowed at the base; scapes shorter than the leaves, simple ; whorls of 
the inflorescence several or numerous, the 2 or 3 lower ones with pistillate flowers; pedicels 
