Par? 1, 1909] ALISMACEAE 57 
than the petioles; scapes simple or sparingly branched ; whorls of the inflorescence few or 
many ; pedicels of the pistillate flowers 1-2 cm. long, usually much shorter than those of 
the stamlnate flowers; bracts ovate, less than 1 cm. long, obtuse or acutish, granular- 
papillose ; sepals obtuse ; corollas 3-4 cm. broad; filaments not dilated, pubescent; anthers 
shorter than the filaments; fruit-heads 1-1.5 cm. in diameter; achenes cuneate, about 2 
mm. long, narrowly winged, the slender beak usually ascending. 
TYPE LOCALITY: Carolina. 
DISTRIBUTION: Delaware to Florida, Texas, and Mexico. 
ILLUSTRATION: Rep. Mo. Bot. Gard. 6: pl. "16 of 3,4, 9: 
18. Sagittaria lancifolia L. Pl. Jam. Pug. 27. 1759. 
? Sagittaria Sellowiana Kunth, Enum. 3: 159. 1841.- 
? Sagitiaria planidginifolia Mart. & Gal. Bull. Acad, Roy. Belg. 92: ae 1842, 
Sagitiaria lancifolia major Micheli, in DC. Monog. Phan, 3: 73. 1881 
Sagittaria lanctfolia media Micheli, in DC. Monog. Phan. 3: 73. 1881. 
Plants emersed or partially submerged, 4-20 dm. tall; leaves erect or ascending, the 
blades leathery, broadly linear to elliptic, 3-6 dm. long, acute, commonly shorter than the 
petioles; scapes mostly taller than the leaves, usually branched, sometimes widely so; 
whorls of the inflorescence numerous; pedicels of the pistillate flowers ascending, often 
shorter than those of the staminate; bracts lanceolate to linear-lanceolate, 1-2.5 cm. long, 
acute or acuminate, striate; sepals obtuse ; corollas 4-5 cm. broad; petals obovate ; filaments 
not dilated, pubescent; anthers shorter than the filaments; fruit-heads fully 1 em. in 
diameter ; achenes cuneate and more or less falcate, 2-3 mm. Ione. gradually narrowed into 
the pene beak, the dorsal wing thick and even. 
TYPE LOCALITY : Jamaica. 
DISTRIBUTION : Florida to Texas, Mexico, central and northern South America, and the West 
Indies, 
ILLUSTRATIONS: Andr. Bot. Repos. 5: £1. 323; Bot. Mag. f/. 1792; Redouté, Lil. p/. 417; Rep. 
Mo. Bot. Gard. 6: pl. 16, f. 1, 2. 
19. Sagittaria angustifolia Lindl. Bot. Reg. p/. 1742. 1828. 
Sagittaria lancifolia angustifolia Lindl.; Griseb. Cat. Pl. Cuba 218. 1866. 
Plants wholly or partially emersed, 7-12 dm. tall; leaves ascending or recurving, the 
blades leathery, linear or nearly so, sometimes very narrow, 1-4 dm. long, attenuate, as 
long as the petioles or shorter; scapes as long as the leaves or longer, usually simple ; 
whorls of the inflorescence ever: pedicels of the pistillate flowers ascending, as long as 
those of the staminate ones or slightly shorter ; bracts lanceolate, sometimes broadly so, 
0.5-1.5 cm. long, acute or acuminate; sepals obtuse; corollas 2-3 cm. broad; filaments not 
dilated, pubescent; anthers as long as the filaments or shorter; fruit-heads 1-1.5 cm. in 
diameter ; achenes cuneate or obliquely obovate, 2-2.5 mm. long, abruptly narrowed into 
the minute beak, the dorsal wing usually crested. 
TYPE LOCALITY: Essequibo, British Guiana. / . . 
DISTRIBUTION: Georgia, Alabama, and Mississippi, and in tropical America. 
ILLUSTRATION: Bot. Reg. pl. 1141. 
20. Sagittaria macrocarpa J. G. Smith, Rep. Mo. Bot. 
Gard. 6: 53. 1894. 
Plants mostly emersed, 3-4 dm. tall; leaves phyllodium-like, erect or nearly so, the 
blades rather imperfect, linear or linear-lanceolate, 5-7 cm. long, much shorter than the 
petioles; scapes erect, overtopping the leaves; whorls of the inflorescence 3-5, the lowest 
2 whorls, or only the lowest, pistillate; pedicels about as long as the internodes except 
those of the pistillate flowers, which are much shorter; bracts ovate, about 3 mm. long, 
acute, united at the base; filaments dilated, pubescent; anthers about as long as the fila- 
ments; fruit-heads 10-12 mm. in diameter; achenes obovate or oblong-obovate, 3 mm. long, 
winged, the beak ascending, rather stout: 
TYPE LOCALITY: South Carolina. : 
DISTRIBUTION : North Carolina and South Carolina. 
ILLUSTRATION : Rep. Mo. Bot. Gard. 6: pl. 27. 
