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Family: Pontederiaceae
grassleaf mudplantain, more, grass-leaf mud-plantain
[Heteranthera graminea (Michx.) Vahl, more, Heteranthera liebmannii (Buch. ex Magnus) Shinners, Zosterella dubia (Jacq.) Small, Zosterella longituba Alexander]
 Arizona State University Herbarium 
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Plant: perennial aquatic herb; vegetative stem submersed and growing to surface or emersed and contracted, procumbent, branching
Leaves: sessile, submersed or emersed, alternate (opposite at nodes with inflorescences), linear, entire, 2-10 cm long, 1-5 mm wide; apex acute; base clasping
Inflorescence: 1-flowered
Flowers: perianth salverform, yellow, the tube 1.5-5 cm long, the lobes linear, obtuse at apex, 4-11 mm long; stamens all of equal size, 2-10 mm long, the filaments centrally inflated, the anthers lanceolate, yellow, coiling after anthesis, 0.9-3.9 mm long
Fruit: SEEDS 7-30, 1.0-1.6 mm long, the testa with longitudinal wings and cross striae between wings
Misc: Rivers and canals; up to 600 m (1800 ft.); fl. Jun.-Oct.; no fr. seen
REFERENCES: Horn, Charles N. 1998 Pontederiaceae. J. Ariz. – Nev. Acad. Sci. 30(2): 133.
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