Sagittaria montevidensis
Linnaea 2: 156. 1827.
Herbs, annual or perennial, to 100 cm; rhizomes present; stolons present; corms present. Leaves submersed and emersed; submersed leaves absent or phyllodial, flattened, to 17 × 2 cm; emersed leaves with petiole triangular, 21–55 cm, blade hastate to sagittate, 2.5–17.5 × 0.6–22 cm, lobes longer than or equal to remainder of blade. Inflorescences racemes or panicles, of 1–15 whorls, floating or emersed, 1.5–28 × 1.5–15 cm; peduncles 15–47 cm; bracts distinct or connate less than ¼ total length, lanceolate to elliptic, 4–34 mm, delicate, not papillose; fruiting pedicels recurved, club-shaped, 0.5–4.2 cm. Flowers 2–5 cm diam.; sepals spreading in staminate, erect in pistillate, enclosing flower or fruiting head; filaments cylindric, longer than anthers, glabrous; pistillate pedicellate, with or without ring of sterile stamens. Fruiting heads 1.2–2.1 cm diam.; achenes oblanceoloid, not abaxially keeled, 2–4.3 × 0.7–1.5 mm, beaked; faces not tuberculate, wings absent, glands 1; beak lateral, horizontal, 0.4–0.8 mm.
Distribution
N.B., Ala., Ark., Calif., Colo., Conn., Del., Fla., Ga., Ill., Ind., Iowa, Kans., Ky., La., Maine, Mass., Md., Mich., Minn., Miss., Mo., N.C., N.H., N.J., N.Mex., N.Y., Nebr., Ohio, Okla., Pa., S.C., S.Dak., Tenn., Tex., Va., W.Va., Wis., Mexico, South America
Discussion
Subspecies 3 (3 in the flora).
Selected References
None.
Lower Taxa
Key
| 1 | Plants of tidal mud flats, often stranded by low tide, emersed blades spatulate, rarely sagittate. | Sagittaria montevidensis subsp. spongiosa |
| 1 | Plants of fresh waters, not stranded by low tide; emersed blades hastate to sagittate. | > 2 |
| 2 | Pistillate flowers without ring of sterile stamens; petals with purple spot at base | Sagittaria montevidensis subsp. montevidensis |
| 2 | Pistillate flowers with ring of sterile stamens; petals without purple spot at base. | Sagittaria montevidensis subsp. calycina |