Sagittaria longiloba Engelm. ex J. G. Sm.

Sagittaria longiloba Engelm. Bot. Mex. Bound
Surv. 212. 1858.
Sagittaria sagittifolia mexicana Mart. & Gal. Bull. Acad. Roy. Belg. 9 2 : 379. 1842. Not S. mexicana Steud. 1841.
Plants mostly emersed, 3-15 dm. tall; leaf-blades 9-23 cm. long, the terminal lobe linear to lanceolate, the basal lobes linear or linear-lanceolate, twice or thrice as long as the terminal one, long-acuminate ; scapes simple or rarely branched ; whorls of the inflorescence 4—8 or more, remote, the one to three lower ones with pistillate flowers ; pedicels slender, 15-35 mm. long, spreading; bracts lanceolate, 6-8 mm. long, acuminate; sepals oblong, oval or obovate, becoming 6-7 mm. long; corolla 1.5-2.5 cm. broad; filaments not dilated, glabrous ; anthers oblong, shorter than the filaments ; fruit-heads 10-15 mm. in diameter ; achenes cuneate, 1 mm. long, the margins somewhat undulate, the beak very short, lateral.
Type locality : San Elceario.
Distribution : Nebraska and Colorado to Texas and Mexico.

Sagittaria greggii J. G. Smith, Rep. Mo. Bot. Gard. 6 : 43. 1894
Plants partially emersed, 9-15 dm. tall ; leaf -blades hastate, 20-40 cm. long, the terminal lobe ovate to lanceolate, acute or slightly acuminate, the basal lobes lanceolate or linear-lanceolate, acuminate, about as long as the terminal one or longer ; scapes 5-angled near the base, branched ; whorls of the inflorescence several or many ; bracts lanceolate or linear-lanceolate, acuminate, 15-30 mm. long ; pedicels of the lower whorls 15-30 mm. long, mostly ascending; sepals oval to obovate, becoming 6-8 mm. long; corolla mostly 1-2 cm. broad, or more; filaments not dilated, glabrous; anthers about as long as the filaments or shorter ; fruit-heads 8-15 mm. in diameter ; achenes obovate to orbicular-obovate, 2-3 mm. long, thick-margined, the beak minute.
Type locality : Mexico. Distribution : California and Mexico.