Xyridaceae


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Xyridaceae

[‚zir·ə′dās·ē‚ē]
(botany)
A family of terrestrial monocotyledonous plants in the order Commelinales characterized by an open leaf sheath, three stamens, and a simple racemose head for the inflorescence.
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Palynological research on Xyridaceae is hindered by limited suitable samples, especially in fluid preserved collections, due to the remote locations of most populations and the brief floral phenology (Carlquist, 1960; Campbell, 2004b).
Pollen from species representing all Xyridaceae genera were examined (Table 1) from samples obtained from dehisced herbarium specimen anthers or from liquid preserved specimens housed at the New York Botanical Garden (fixed in FPA and later transferred to 70% ethanol; Johansen, 1940).
Pollen in Xyridaceae is liable to alteration (see also Carlquist, 1960) and variation in grain size and other harmomegathic effects due to ambient conditions effecting moisture, and preservation and preparation techniques.
Clypeate pollen occurs in several unrelated Angiosperm families (Halbritter & Hesse, 1995), and in Xyridaceae is thus far known only in Achlyphila.
Observations of pollen morphology using scanning electron microscopy further distinguish the genera of Xyridaceae.
Table 3 Palynological references for Xyridaceae (a) Taxon Reference Abolboda acaulis Maguire Carlquist, 1960 Abolboda bella Maguire Carlquist, 1960 Abolboda ebracteata Maguire & Wurdack var.
Anatomy and systematics of Xyridaceae with special reference to Aratitiyopea.
14B) Juncaceae Crassinucellate Marantaceae Crassinucellate Mayacaceae Tenuinucellate Musaceae Crassinucellate Philydraceae Crassinucellate Poaceae Tenuinucellate or crassinucellate Pontederiaceae Crassinucellate Rapateaceae Crassinucellate Restionaceae Tenuinucellate (except dlexgeorgia) Sparganiaceae Crassinucellate Strelitziaceae Crassinucellate Thurniaceae Unknown Typhaceae Crassinucellate Velloziaceae Tenuinucellate Xyridaceae Tenuinucellate Zingiberaceae Crassinucellate Family References(*) Anarthriaceae Linder & Rudall, 1993 Arecaceae Dahlgren et al.