Najas marina

holly-leaved naiad
spiny water nymph
大茨藻 da ci zao
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Monocots
Order: Alismatales
Family: Hydrocharitaceae
Genus: Najas
Species: N. marina
Binomial name
Najas marina
L.
Synonyms[1]
  • Ittnera major (All.) C.C.Gmel.
  • Ittnera najas C.C.Gmel.
  • Najas fluviatilis Poir.
  • Najas fucoides Griff.
  • Najas gracilis (Morong) Small
  • Najas laevis Lojac.
  • Najas latifolia A.Braun
  • Najas major All.
  • Najas maritima Pall.
  • Najas microcarpa (A.Braun) Bolle ex Christ
  • Najas monosperma Willd.
  • Najas muricata Thuill.
  • Najas polonica Zalewski
  • Najas tetrasperma Willd.

Najas marina is a species of aquatic plant known by the common names spiny water nymph, spiny naiad and holly-leaved naiad. It is an extremely widespread species, reported across Europe, Asia, Africa, Australia, the Americas and many oceanic islands. It can be found in many types of freshwater and brackish aquatic habitat, including bodies of alkaline water.[2][3][4]

Najas marina is an annual producing a slender, branching stem up to 40 or 45 centimeters in maximum length. The evenly spaced leaves are up to 4 centimeters long, 1 to 3 millimeters wide, and edged in tiny sawlike teeth. The leaf has prickles along its midvein. Minute flowers occur in the leaf axils. The plant is dioecious, with male and female flower types occurring on separate individuals.[5][3][4][6][7]

Varieties and subspecies

A long list of varietal and subspecific names have been proposed over the years. At present, only 9 are widely accepted:[1][8]

References

  1. 1 2 The Plant List
  2. ↑ Stuckey, R. L. 1985. Distributional history of Najas marina (spiny naiad) in North America. Bartonia 51: 2--16.
  3. 1 2 Flora of North America vol 22 Najas marina
  4. 1 2 Flora of China v 23 p 92 Najas marina
  5. ↑ Carl Linnaeus. 1753. Species Plantarum 2: 1015.
  6. ↑ Tzvelev, Nikolai Nikolaievich. 1976. Novosti Sistematiki Vysshikh Rastenii. Moscow & Leningrad 13: 18, Najas major var. polonica
  7. ↑ Triest, Ludwig J. 1988. Mém. Acad. Roy. Sci. Outre-Mer, Sci. Nat. Nouv. Sér. 22(1): 54 Najas marina var. ohwii
  8. ↑ Kew World Checklist of Selected Plant Families, genus Najas


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