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northern water-starwort

Scientific Name: Callitriche hermaphroditica

Family: Callitrichaceae

Category: Dicot

Growth: Forb/herb

Duration: Perennial

Other Names: NY (autumnal water-starwort)

       

Water Starwort (Callitriche hermaphroditica)

Water Starwort, also known as Northern Water-starwort or Autumnal Water-starwort, is an aquatic herb belonging to the family Callitrichaceae. Several species exist, each with varying characteristics and habitats.

Considerations for Pets

  • Water starwort leaves are bright green, egg-shaped, and float on the water's surface. While their soft texture may not pose a significant risk, it is prudent to prevent pets from ingesting large quantities of any plant material.

Taxonomy and Nomenclature

  • Scientific Name: Callitriche hermaphroditica L.
  • Family: Callitrichaceae
  • Synonyms: Callitriche autumnalis, Callitriche fassettii
  • Other Common Names: Northern Water-starwort, Autumnal Water-starwort, Narrow-leaf Water Starwort, Autumn Waterstarwort, Scarlet Waterstarwort, Twoheaded Water Starwort, Greater Water Starwort.

Distribution and Habitat

  • Water Starwort is commonly found in quiet, fresh waters.
  • It is described as a native plant in most parts of mainland Europe and in northern Africa.
  • Several species within the Callitriche genus are found in the Arctic.

Morphological Characteristics and Growth Habits

  • Water Starwort is an aquatic herb.
  • It features bright green, egg-shaped leaves that float on the surface of the water.
  • Stems can grow up to 60 cm long. Submerged leaves are narrowly elliptical, while floating leaves are often in a rosette.
  • It can form dense mats at the surface of the water.

Ecological Role

  • It can form dense mats at the surface of the water.

Further Resources

  • USDA-NRCS PLANTS Database
  • RHS (Royal Horticultural Society)
  • Northern Ireland Environment Agency