Najas marina
| holly-leaved naiad spiny water nymph 大茨藻 da ci zao |
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N. marina
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| Najas marina |
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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
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A long list of varietal and subspecific names have been proposed over the years. At present, only 9 are widely accepted:[1][8]
- Najas marina subsp. arsenariensis (Maire) L.Triest - Algeria
- Najas marina var. brachycarpa Trautv. - China and Kazakhstan
- Najas marina subsp. commersonii L.Triest - Madagascar, Mauritius, Réunion
- Najas marina var. grossidentata Rendle - Korea and Manchuria
- Najas marina var. intermedia (Wolfg. ex Gorski) Rendle - Spain, Sicily, Africa, the Middle East, China, Sri Lanka
- Najas marina var. marina
- Najas marina subsp. marina
- Najas marina subsp. sumatrana (W.J.de Wilde) L.Triest - Sumatra
- Najas marina var. zollingeri Rendle - Bali
References
- ↑ 1.0 1.1 The Plant List
- ↑ Stuckey, R. L. 1985. Distributional history of Najas marina (spiny naiad) in North America. Bartonia 51: 2--16.
- ↑ 3.0 3.1 Flora of North America vol 22 Najas marina
- ↑ 4.0 4.1 Flora of China v 23 p 92 Najas marina
- ↑ Carl Linnaeus. 1753. Species Plantarum 2: 1015.
- ↑ Tzvelev, Nikolai Nikolaievich. 1976. Novosti Sistematiki Vysshikh Rastenii. Moscow & Leningrad 13: 18, Najas major var. polonica
- ↑ Triest, Ludwig J. 1988. Mém. Acad. Roy. Sci. Outre-Mer, Sci. Nat. Nouv. Sér. 22(1): 54 Najas marina var. ohwii
- ↑ Kew World Checklist of Selected Plant Families, genus Najas
External links
- Jepson Manual Treatment
- USDA Plants Profile
- Flora of North America
- GRIN Species Profile
- Photo gallery
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