Heteranthera reniformis |
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kidney-leaf mud-plantain |
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Habit | Plants annual or facultatively perennial. |
Vegetative stems | submersed with elongate internodes, or emersed and procumbent. |
Flowering stems | 1–9 cm, distal internode 0.5–4 cm. |
Inflorescences | spicate, 2–8-flowered, elongating in 1 day, usually shorter than spathes, terminal flower sometimes extending beyond spathe apex; spathes 0.8–5.5 cm, glabrous; peduncle 0.5–4.2 cm, glabrous. |
Flowers | opening ca. 3 hours after sunrise, wilting by early afternoon; perianth white, salverform, tube 5–10 mm, limbs zygomorphic, lobes narrowly elliptic, 3–6.5 mm, distal central lobe with yellow or green region at base, sometimes with distal brown spot; stamens unequal, lateral stamens 0.9–2.2 mm, filaments linear, pubescent with white multicellular hairs toward apex; central stamen 2.2–4.7 mm, filament sparsely pubescent with multicellular hairs; style pubescent with multicellular hairs. |
Seeds | 8–14-winged, 0.5–0.9 × 0.3–0.5 mm. |
Sessile | leaves forming basal rosette, blade linear to oblanceolate, thin, 2.4–3.7 cm × 3–8 mm. |
Petiolate | leaves floating or emersed; stipule 1–5 cm; petiole 2–13 cm; blade reniform, 1–4 × 1–5 cm, length equal to or less than width, apex obtuse. |
2n | = 48. |
Heteranthera reniformis |
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Phenology | Flowering Jun–Oct. |
Habitat | Roadside ditches, edges of streams and ponds, freshwater tidal mudflats |
Elevation | 0–2600 m (0–8500 ft) |
Distribution |
AL; CT; DE; FL; GA; IL; IN; KY; LA; MD; MO; MS; NC; NJ; NY; OH; PA; SC; TN; TX; VA; WV; Mexico; throughout Central America; scattered in South America (Argentina, Brazil, Paraguay); naturalized in Italy
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Source | FNA vol. 26, p. 43. |
Parent taxa | Pontederiaceae > Heteranthera |
Sibling taxa | |
Synonyms | Heterandra reniformis |
Name authority | Ruiz & Pavon: Fl. Peruv. 1: 43. (1798) |
Web links |