spermatophyte

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spermatophyte

[spər′mad·ə‚fīt]
(botany)
Any one of the seed-bearing vascular plants.
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The elevational patterns of other plant groups were similar with the distribution of overall plants, although the elevation of richness peak varied somewhat; namely, richness of seed plants peaked at 12001300 m a.s.l., lower than the peak elevation of bryophytes and ferns (between 1800 m and 2000 m a.s.l.
Moreover, the analysis indicated that more than 40% of the data points fell outside the 95% confidence interval of the MDE null model for species richness (93%, 87%, 40%, and 90% for overall plants, seed plants, bryophytes, and ferns, resp.).
Specifically, area and MAP had a relative higher coefficient of determination with overall plants and seed plants, and bryophytes highly correlated with area, MDE, and MAP, whereas ferns were more related to MAT and MAP.
The two-order polynomial regression showed that elevational range size was significantly correlated with elevation (P < 0.001); furthermore the fitting curve was well consonant with the data points ([R.sup.2] = 0.76, 0.68, 0.71, 0.55 for overall plants, seed plants, bryophytes, and ferns, resp.).
(multispermy) in Microcycas among extant seed plants is thus an
autapomorphy of Microcycas within extant seed plants (Fig.
to evolved at least six times in extant seed plants. In contrast, the
parallel development of diplospermy in other seed plants and other
Extant seed plants comprise five clades [ILLUSTRATION FOR FIGURE 1 OMITTED]: cycads, Ginkgo, conifers, angiosperms, and Gnetales (Ephedra, Welwitschia, Gnetum).
In all seed plants, the entire ontogeny of the seed plant female gametophyte occurs within the confines of the sporophytic tissues of the ovule.
The female gametophytes of all nonflowering clades of seed plants ultimately function in the nourishment of developing embryos.
Within the context of the structurally diverse female gametophytes of seed plants, it has long been recognized (Coulter 1914) that some of the most anomalous seed plant female gametophytes are found in species of Gnetum, which with Welwitschia and Ephedra comprise the Gnetales.