Gnetales


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Related to Gnetales: gnetum, Ginkgoales

Gnetales

[nə′tā·lēz]
(botany)
A monogeneric order of the subdivision Gneticae; most species are lianas with opposite, oval, entire-margined leaves.
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However studies of the distantly related Gnetales may not benefit to as a large degree compared to those of conifers.
gnemon is compared explicitly to the plesiomorphic developmental patterns expressed in the female gametophytes of basal extant seed plants (cycads and Ginkgo) and to Ephedra, which is basal within Gnetales [ILLUSTRATION FOR FIGURE 1 OMITTED].
This requires clear estimation of the phylogenetic position of Gnetum within the Gnetales and more global hypotheses of the relationships of Gnetales to other groups of seed plants [ILLUSTRATION FOR FIGURE 1 OMITTED].
Finally, it is evident that Ephedra, which is basal among Gnetales, has also retained a pattern of female gametophyte development that is highly similar to that of basal seed plants (Martens 1971; Moussel 1983).
As pointed out earlier, dioecy offers problems for a switch to animal pollinators because a similar attractant must exist in individuals of both genders, as is most striking in Gnetales.
The only extant coniferophytes with micro- and mega-sporophylls in the same strobilus are the Gnetales, but they are functionally unisexual so that plants are dioecious.