Degeneria

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Degeneria
Scientific classification e
Kingdom: Plantae
Clade: Angiosperms
Clade: Magnoliids
Order: Magnoliales
Family: Degeneriaceae
I.W.Bailey & A.C.Sm.[1]
Genus: Degeneria
I.W. Bailey & A.C.Sm.
Species

Degeneria is a genus of flowering plants endemic to Fiji. It is the only genus in the family Degeneriaceae. The APG IV system of 2016 (unchanged from the APG system of 1998, the APG II system of 2003 and the APG III system of 2009), recognizes this family, and assigns it to the order Magnoliales in the clade magnoliids.[1][2]

Degeneria was named after Otto Degener, who first found D. vitiensis in 1942. The genus contains two species of trees in Fiji:

Floral structure[edit]

The floral structure of Degeneria is unusual, considered to be primitive among the flowering plants.[3] The stamens are similar to those in Austrobaileya, Galbulimima, and some Magnoliaceae; they do not have distinguishable anther, filament, and connective, but instead are leaf-like, with two pairs of microsporangia embedded in the surface. There are three veins, rather than the single vein in the stamen of most flowering plants.[3] The gynoecium develops in an unusual way, similar to Winteraceae, with laminal placentation, i.e., the young carpel is cup-shaped, and the ovules develop on its upper surface. The margins of the carpel never fully fuse. A cleft remains filled with hairs, through which the pollen tubes grow towards the ovules.[3]

References[edit]

  1. ^ a b Angiosperm Phylogeny Group (2009). "An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants: APG III". Botanical Journal of the Linnean Society. 161 (2): 105–121. doi:10.1111/j.1095-8339.2009.00996.x.
  2. ^ "An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants: APG IV". Botanical Journal of the Linnean Society. 181 (1): 1–20. 2016. doi:10.1111/boj.12385. ISSN 0024-4074.
  3. ^ a b c Gifford, E.M.; Foster, A.S. (1989). Morphology and evolution of vascular plants. New York: W. H. Freeman and Company.

External links[edit]