60 NORTH AMERICAN FLORA (VorumE 17 
ovate to lanceolate, about one half as long as the blade or longer; scapes 3-6 dm. tall, 
pubescent ; whorls of the inflorescence remote; pedicels variable in length, sometimes sur- 
passing the bracts; bracts ovate or suborbicular, obtuse, 7-10 mm. long, densely pubescent; 
sepals orbicular-ovate to reniform, pubescent; filaments not dilated, glabrous; fruit-heads 
8-15 mm. in diameter; achenes somewhat anvil-shaped or resembling the head of a bird, 
2-3 mm. long, the beak horizontal or somewhat declined, mostly longer and firmer than 
that of S. latifolia. 
TYPE LOCALITY: Pennsylvania. 
DISTRIBUTION : New Jersey and Pennsylvania to western Tennessee, Alabama, and Florida. 
ILLUSTRATION: Rep. Mo. Bot. Gard. 6: p/. 8, 
28. Sagittaria latifolia Willd. Sp. Pl. 4: 409. 1806. 
Sagittaria sagittifolia l,. Sp. Pl. 993, in part. 1753. 
Sagitiaria obtusa Willd. Sp. Pl. 4: 409. 1806. 
Sagitlaria gracilis Pursh, Fl. Am. Sept. 396. 1814. 
Sagittaria simplex Pursh, Fl. Am. Sept. 396. 1814. 
Sagitiaria hastata Pursh, Fl. Am. Sept. 396. 1814. 
Sagillaria sagittifolia latifolia Torr. Comp. 355. 1826. 
Sagitiaria sagittifolia hastata Torr. Comp. 355. 1826. 
Sagittaria sagitiifolia gracilis Torr. Comp. 356. 1826. 
Sagittaria sagittifolia macrophylla Hook. Fl. Bor. Am. 2: 167. 1838. 
Sagitiaria sagittifolia vulgaris Hook. Fl. Bor. Am. 2: 167. 1838. 
Sagittaria variabilis Engelm. in A. Gray, Man. 461. | 1848. 
Sagittaria variabilis angustifolia Engelm. in A. Gray, Man. ed. 5. 493. 1867. 
Sagitiaria variabilis gracilis Engelm. in A. Gray, Man. ed. 5. 493. 1867. 
Sagittaria variabilis obtusa Engelm. in A. Gray, Man. ed. 5. 493. 1867. 
Sagittaria variabilts latifolia Engelm. in A. Gray, Man. ed. 5. 493. 1867. 
Sagittaria sagittifolia variabilis Micheli, in DC. Monog. Phan. 3: 69. 1881. 
Sagittaxia chinensis Parish, Zoe 1: 122. 1890. NotS. sizensis Sims. 1833. 
Sagitiaria sagtitifolia sinensis Brand. Zoe 4: 217. 1893. Not S. sénensis Sims. 1833. 
Sagittaria esculenia Howell, Fl. NW. Am. 679. 1903. 
Sagittaria latifolia glabra Buch. in Engler, Pflanzenreich 445: 50. 1903. 
Plants partially or wholly emersed, 2-14 dm. tall; leaves very variable, mostly erect 
or ascending, the blades sometimes broader than long, 10-40 em. long, glabrous, the ter- 
minal lobe varying from deltoid or ovate to linear, the basal lobes ovate, lanceolate, or 
linear, acute or acuminate; scape erect, angled, glabrous; bracts ovate, mostly less than 
1 cm. long, glabrous, acute or obtusish; whorls of the inflorescence mostly distant ; ped- 
icels variable, those bearing pistillate flowers 2-5 cm. long or longer, or sometimes 
shorter ; filaments not dilated, glabrous; fruit-heads 1.5-3 cm. in diameter; achenes obo- 
vate, usually broadly so, about 3 mm. long, broadly winged, especially at the top, the beak 
horizontal or nearly so. 
TYPE LOCALITY: Canada to Carolina. ‘ . : . 
DISTRIBUTION: New Brunswick and Nova Scotia to British Columbia, Florida, California, 
Mexico, and Central America. . 
ILLUSTRATIONS: Rep. Mo. Bot. Gard. 6: p/. 3-6 (except fl. 3, f. 4, pl. 4, f. 3,6); Britt. & 
Brown, Ill. Fl. 7. 195, Engler, Pflanzenreich 45: f. 16, D (fruit). 
29. Sagittaria mexicana Steud. Nom. Bot. ed. 2. 491. 1841. 
Sagittaria macrophylla Zucc. Abh. Akad. Muench, 1832: 289. 1832. Not S. macrophylla Bunge. 
1831. 
Plants mostly emersed, 3-11 dm. tall; leaves erect or nearly so; blades lanceolate to 
oblong-lanceolate, sometimes hastate, 8-20 cm. long, acute or acuminate, the basal lobes, 
when present, narrow, spreading or recurved, much shorter than the terminal lobe ; scapes 
about as tall as the leaves, simple; whorls of the inflorescence few, usually 3-5; pedicels 
much longer than the bracts, those of the pistillate flowers 5-7 cm. long, much longer than 
those of the staminate; bracts broad, united nearly to the apex, glabrous; sepals oblong 
to ovate, becoming 8-10 mm. long, glabrous; filaments not dilated, glabrous; anthers 
oblong, shorter than the filaments; fruit-heads very long-pedicelled; achenes (partially 
mature) broadly winged, the beak long, horizontal. 
TYPE LOCALITY : Mexico. 
DISTRIBUTION : Mexico. 
ILLUSTRATION : Rep. Mo. Bot. Gard. 6: p/, 27. 
