Alismatidae


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Alismatidae

[ə‚liz′mad·ə‚dē]
(botany)
A relatively primitive subclass of aquatic or semiaquatic herbaceous flowering plants in the class Liliopsida, generally having apocarpous flowers, and trinucleate pollen and lacking endosperm.
References in periodicals archive ?
Re-evaluation of certain key relationships in the Alismatidae: Floral organogenesis of Scheuchzeria palustris (Scheuchzeriaceae).
Previous studies of reproductive structures in the helobial monocotyledons (Alismatidae) indicate that partitioning between flower and inflorescence is not always clear (e.g., Lilaea, Scheuchzeria) and that this may be the result of ancestral, unisexual modules coming together to form flowers and/or inflorescences.
If this interpretation is correct, the inflorescence in Halophila shows a rather different form of sterilization than do the stoloniferous types and reinforces Wilder's (1975) conclusion that sterilizatio n of inflorescences is probably polyphyletic in the Alismatidae.
The Nymphaeales, Alismatidae, and the theory of an aquatic monocotyledon origin.