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Distribution: An almost cosmopolitan family of eight genera and c. 150 species with
the main centre of diversity in Australia where there are six genera (since the Flora
of Australia treatment, the Australian Plant Census no longer recognises Meziella,
but does recognise Trihaloragis) and 110 species (105 species described in the the
Flora of Australia). In Australia, these genera are concentrated in temperate areas,
with some species almost throughout the continent. A few species are minor weeds of
agriculture and waterways.
Description: This family consists of ephemeral, annual, perennial herbs, subshrubs,
shrubs and rarely small trees.
For more details regarding the description of species within this family please see:
https://profiles.ala.org.au/opus/foa/profile/Haloragaceae
Pollen Morphology: The pollen produced by this family are trapezoid/pentagonal shaped
in polar view and oblate in equatorial view. These pollen are between 20-25 um in
size and have 4-5 pores that have distinct thickenings around them. The surface texture
of these grains is regulate, with the exine being thick and pronounced.
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