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Helianthus paradoxus, the paradox sunflower, puzzle sunflower or Pecos sunflower, is a threatened species of sunflower found only in west Texas, Utah, and New Mexico salt marshes by the edges of inland salt lakes and salt flats. This species was added to the Endangered Species Act on October 20, 1999. It is found in spring seeps, wet meadows, pond margins, and stream courses. All these populations are dependent on natural groundwater deposits.

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  • دوار الشمس المفارق (ar)
  • Helianthus paradoxus (es)
  • Helianthus paradoxus (en)
  • Helianthus paradoxus (pt)
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  • دوار الشمس المُفارق نوع نباتي يتبع جنس دوار الشمس من الفصيلة النجمية. (ar)
  • Helianthus paradoxus es una planta de la familia Asteraceae, se encuentra únicamente en el oeste de Texas y de Nuevo México; es considerada una especie en riesgo. H. paradoxus es un híbrido estable de H. annuus, el girasol común, y , y es más tolerante a la sal que otras especies del género. H. paradoxus aparece en áreas salitrosas, con niveles de 10 a 40 partes por mil. Debido a esta habilidad de sobrevivir a esta salinidad, H. paradoxus es considerada una halófita. (es)
  • Helianthus paradoxus é uma espécie do gênero botânico Helianthus, da família das Asteraceae. É uma espécie ameaçada de girassol encontrada somente em pântanos salinos da região oeste do Texas e Novo México. O H. paradoxus é provavelmente um híbrido estável da H. annuus, girassol comum, e a H. petiolaris, e é mais resistente ao sal do que uma ou outra espécie paterna. O H. paradoxus foi encontrado em áreas com níveis de salinidade variando entre 10 a 40 partes por mil. Por suportar tais níveis elevados de salinidade aH. paradoxus é considerada uma planta halófita. (pt)
  • Helianthus paradoxus, the paradox sunflower, puzzle sunflower or Pecos sunflower, is a threatened species of sunflower found only in west Texas, Utah, and New Mexico salt marshes by the edges of inland salt lakes and salt flats. This species was added to the Endangered Species Act on October 20, 1999. It is found in spring seeps, wet meadows, pond margins, and stream courses. All these populations are dependent on natural groundwater deposits. (en)
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  • http://commons.wikimedia.org/wiki/Special:FilePath/Pecos_sunflower.jpg
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  • Helianthus (en)
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  • paradoxus (en)
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  • دوار الشمس المُفارق نوع نباتي يتبع جنس دوار الشمس من الفصيلة النجمية. (ar)
  • Helianthus paradoxus es una planta de la familia Asteraceae, se encuentra únicamente en el oeste de Texas y de Nuevo México; es considerada una especie en riesgo. H. paradoxus es un híbrido estable de H. annuus, el girasol común, y , y es más tolerante a la sal que otras especies del género. H. paradoxus aparece en áreas salitrosas, con niveles de 10 a 40 partes por mil. Debido a esta habilidad de sobrevivir a esta salinidad, H. paradoxus es considerada una halófita. (es)
  • Helianthus paradoxus, the paradox sunflower, puzzle sunflower or Pecos sunflower, is a threatened species of sunflower found only in west Texas, Utah, and New Mexico salt marshes by the edges of inland salt lakes and salt flats. Helianthus paradoxus formed 75,000-208,000 years ago as a hybrid of H. annuus, the common sunflower, and Helianthus petiolaris, the prairie sunflower. The hybrid is more tolerant of salt than either parent species. Helianthus paradoxus is found in areas with salinity levels range from 10 to 40 parts per thousand. Due to its ability to withstand such high levels of salt, H. paradoxus is considered to be a halophyte. Pecos sunflower is an annual, herbaceous plant. It grows 1–3 meters (3.3–9.8 ft) tall and is branched at the top. The leaves are opposite on the lower part of the stem but alternate at the top, lance-shaped with three prominent veins, and up to 17.5 centimeters (6.9 in) long by 8.5 cm (3.3 in) wide. The stem and leaf surfaces have a few short, stiff hairs. Flower heads are 5–7 cm (2–3 in) in diameter with bright yellow rays around a dark purplish brown center (the disc flowers). Flowers are produced in September and October, much later than many other sunflowers. This species was added to the Endangered Species Act on October 20, 1999. It is found in spring seeps, wet meadows, pond margins, and stream courses. All these populations are dependent on natural groundwater deposits. (en)
  • Helianthus paradoxus é uma espécie do gênero botânico Helianthus, da família das Asteraceae. É uma espécie ameaçada de girassol encontrada somente em pântanos salinos da região oeste do Texas e Novo México. O H. paradoxus é provavelmente um híbrido estável da H. annuus, girassol comum, e a H. petiolaris, e é mais resistente ao sal do que uma ou outra espécie paterna. O H. paradoxus foi encontrado em áreas com níveis de salinidade variando entre 10 a 40 partes por mil. Por suportar tais níveis elevados de salinidade aH. paradoxus é considerada uma planta halófita. (pt)
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