Zosteraceae


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Zosteraceae

[‚zäs·tə′rās·ē‚ē]
(botany)
A family of monocotyledonous plants in the order Najadales; the group is unique among flowering plants in that they grow submerged in shallow ocean waters near the shore.

Zosteraceae

 

eelgrasses, a family of monocotyledonous plants. They are perennial underwater sea grasses with creeping or thick tuberous rhizomes. The stems are flattened, and the leaves are linear and sheathed at the base. The flowers are unisexual or bisexual, without a perianth or with only a rudimentary one. The family comprises two genera and approximately 15 species that grow mainly in sand or silt and between rocks. Representatives of monoecious plants of the genus Zostera and dioecious plants of the genus Phyllospadix are found in the USSR (one species of the latter genus is found only in the Far East). All members of the family Zosteraceae are adapted for underwater fertilization.

REFERENCE

Takhtadzhian, A. L. Sistema ifilogeniia tsvetkovykh rastenii. Moscow-Leningrad, 1966.
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marchantioides (A) (B) Zosteraceae (A) (A) (B) (A) (B) (A) (B) Bacillariophyceae Terrestrial plant (A) (A) (B) Hydrozoa (A) (B) (A) Bryozoa (A) (B) (B) (A) (B) Gastropoda (B) (A) (B) Eumalacostraca (A) (B) (A) (B) (A) (B) Crustacea (A) (B) (A) (B) (A) (B) (A) (B) Feather of terrestrial insect Feather of bird (A) (A) Plastic (A) Others * (A) (B) (A) (B) (A) (B) (A) (B) 1998 Species Oct.
The clearest examples of this trend are in the submersed aquatics of the Alismatales such as Aponogetonaceae or Zosteraceae, in which vessels may have been lost simply because so little xylem is produced.
For example, the lack of vessels in submersed aquatics such as Aponogetonaceae and Zosteraceae is an apomorphic condition, not a primitive one, and probably involves an ontogenetic foreshortening, by forming no late metaxylem.