Gnetales

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Gnetales

an order of GYMNOSPERMS whose members have true vessels in the secondary wood and an absence of archegonia in the ovule. In these features they resemble ANGIOSPERMS.

References in periodicals archive ?

Keywords: Chhidru Formation, Palynomorphs, Monocolpate, Sulcate, Gymnosperms, Peltasperms, Gnetales, Medullosales and Ephedralels.

LATE-PERMIAN MONOCOLPATE AND SULCATE POLLEN FROM CHHIDRU FORMATION, SALT RANGE, PAKISTAN

Gnetales (Ephedra, Gentum, Welwitschia) is a distinct lineage among the six major groups of extant gymnosperms which has occupied various and contested positions in hypothesized seed plant phytogenies (Graham & lies, 2009; Mathews, 2009; Rydin and Korall, 2009).

Degradome and secretome of pollination drops of Ephedra

Phylogeny of seed plants based on all three plant genomic compartments: extant gymnosperms are monophyletic and Gnetales are derived conifers.

The systematic position of the monocotyledons inferred from 26S RNA gene DNA sequences

Extant seed plants comprise five clades [ILLUSTRATION FOR FIGURE 1 OMITTED]: cycads, Ginkgo, conifers, angiosperms, and Gnetales (Ephedra, Welwitschia, Gnetum).

Heterochrony and developmental innovation: evolution of female gametophyte ontogeny in Gnetum, a highly apomorphic seed plant

Structure and function of female and bisexual organ complexes in Gnetales.

A biophysical perspective on the pollination biology of Ephedra nevadensis and E. trifurca

What Brown most importantly recognized, albeit in a somewhat circumlocutious way, was that in cycads, conifers and Gnetales, among extant seed plants, the ovules receive pollen directly, whereas in flowering plants the ovule, being enclosed within a carpel, cannot receive pollen, that being the function of the stigma.

Rescuing Robert Brown--the origins of angio-ovuly in seed cones of conifers

Rudall is doubtful that the monocot cambium is equivalent to secondary thickening meristematic activity in non-monocot angiosperms and Gnetales, and indeed, it is not.