Zosterella dubia (Jacq.) Small
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Authority
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
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Family
Pontederiaceae
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Scientific Name
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Description
Species Description - Perennial, sometimes fl the first year; stems usually submersed, elongate, branched, slender; lvs without petiole or midrib, linear, obtuse, to 15 cm, 2–6 mm wide, or smaller and thicker when emersed; spathe 2–5 cm, slender, abruptly short-caudate at the spreading tip; perianth-tube 1.5–11 cm, the limb spreading, 1–2 cm wide, pale yellow, the outer segments linear, the inner lance-linear; filaments inflated near the middle, tapering to the ends; fr narrowly ovoid, 1 cm, indehiscent, with 7–30 seeds; 2n=30. In quiet water, or sometimes on mud-flats; s. Que. to N.D. and Wash., s. to Cuba and C. Amer. (Heteranthera d.)