Gnetophyta - Wikipedia
Gnetophyta (/ n ɛ ˈ t ɒ f ɪ t ə, ˈ n ɛ t oʊ f aɪ t ə /) is a division of plants (alternatively considered the subclass Gnetidae or order Gnetales), grouped within the gymnosperms (which also includes conifers, cycads, and ginkgos), that consists of some 70 species across the three relict genera: Gnetum (family Gnetaceae), Welwitschia ...
Gnetophyte | Definition, Plants, Characteristics, Reproduction ...
Gnetophyte, any member of the division Gnetophyta, a small group of gymnospermous vascular plants that are represented by three living genera: Ephedra, Gnetum, and Welwitschia. The three genera exhibit great diversity in the immense variety of form and size among the various species.
Gnetophyta (gnetophytes) description - The Gymnosperm Database
Description of the evolution, biology, distribution, ecology, and uses of the species in the conifer class Gnetophyta (gnetophytes).
Gnetophyta - Basic Biology
2016年1月16日 · Gnetophyta. The gnetophytes are a strange group of plants. They include approximately 70 species of gymnosperms that each exhibit a number of flowering characteristics which have led people to believe they may be the predecessors to …
8.5: Gnetophytes - Biology LibreTexts
2024年1月31日 · Gnetophytes (Phylum Gnetophyta) Gnetales are the least familiar group of gymnosperms. There are 112 species in the world (Christenhusz and Byng, 2016), being divided into three main subgroups: Welwitschia (1 species), Gnetales (43 …
7.3: Gnetophytes - Biology LibreTexts
Gnetophytes represent an anatomically and genetically difficult group to classify. They have several traits in common with angiosperms, such as vessel elements in the xylem, double fertilization, and a covering over their seeds. Even their …
2.6.2.2: Conifers and Gnetophytes - Biology LibreTexts
Use morphological features and life history traits to distinguish gnetophytes from other plants. Describe the traits gnetophytes share with angiosperms. Though the gnetophytes have been difficult to place, phylogenetically, recent genetic studies place them as sister to the Pinaceae (pine family, emerging from within the conifers.
Gnetaceae | Gnetales, Gymnosperms, Conifers | Britannica
Gnetaceae, a family of tropical gymnosperms in the order Gnetales (division Gnetophyta), composed of one genus, Gnetum, with 30 or more species. Trees predominate among the African species; most of the Asian varieties are woody vines, but among the exceptions is G. gnemon, a tree about 20 metres.
Gnetophyta - botit.botany.wisc.edu
Male cone mostly compound, and associated with bracts. Fertilization occurs through pollen-tubes with two male nuclei. Double fertilization is recorded for some members of the phylum as in angiosperms, although the two are not exactly homologous. Insect pollination is likely due to cone exudations . Examples:
Gnetophyta - an overview | ScienceDirect Topics
The Gnetales or gnetophytes, also referred to as the Gnetopsida or Gnetophyta, are an interesting group containing three extant families: Ephedraceae (consisting solely of Ephedra, with ca. 40 species), Gnetaceae (consisting solely of Gnetum [including Vinkiella], with ca. 30 species), and the Welwitschiaceae (monospecific, consisting of ...