Degeneria was named after Otto Degener, who first found D. vitiensis in 1942. Classical studies of native stands of Degeneria from Vanua Levu and Viti Levu islands were conducted more than 30 years ago.[3][4][5]
A 45-cent stamp issued in 1988 depicted a flowering branch of Degeneria vitiensis. This species appears on Fiji's five-dollar bill. A one-dollar 1988 philatelic commemorated the discovery of Degeneria roseiflora earlier in that same year.
The genus contains two species of trees, both native to Fiji:[6][7]
The stage-specific movements of floral organs, including scent emissions of degenerias studied by Miller in 1989, are remarkably similar to those observed in other Magnoliales.[8][9][10] Further, the floral structure of Degeneria is unusual, considered to be primitive among the flowering plants.[11] 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.[11] 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.[11]
References
^ abAngiosperm 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.
^"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.
^Miller, J. M. 1988. A new species of Degeneria (Degeneriaceae) from Fiji Archipelago. Journal of the Arnold Arboretum 69: 275–280
^Miller, J. M. 1988. Puzzling new floral variation in a possible Mesozoic relict flowering plant, Fiji Islands. P. 4, In: H. J. de Blij (ed.), Letters, National Geographic Research Volume 4. Washington, D. C.: National Geographic Society, 144 pp.
^Miller, J. M. 1989. The archaic flowering plant family Degeneriaceae: its bearing on an old enigma. National Geographic Research 5(2): 218–231
^"Degeneria I.W.Bailey & A.C.Sm". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 2019-12-27.
^Smith, A. C. 1991. Degeneriaceae Pp. 587-588 In: A. C. Smith, Flora Vitiensis Nova, Volume 5. Lawai: National Tropical Botanical Garden, 626 pp.
^Bernhardt, P. and L. B. Thien. 1987. Self-isolation and insect pollination in the primitive angiosperms: new evaluations of older hypotheses. Plant Systematics and Evolution 156(3–4): 159–176
^Pang, C.-C. and R. M. K. Saunders. 2014. The evolution of alternative mechanisms that promote outcrossing in Annonaceae: a self-compatible family of early divergent angiosperms. Botanical Journal of the Linnean Society 174: 93–109
^Pang, C.-C. and R. M. K. Saunders. 2015. Floral biology and pollination ecology of Desmos chinensis (Annonaceae): Assessing the efficacy of floral synchrony for promoting xenogamy. International Journal of Plant Sciences 176(4): 333–345
^ abcGifford, E.M.; Foster, A.S. (1989). Morphology and evolution of vascular plants. New York: W. H. Freeman and Company.
External links
in L. Watson and M.J. Dallwitz (1992 onwards). : descriptions, illustrations, identification, information retrieval. Version: 27 April 2006. .
photograph of a flower and a developing fruit
NCBI Taxonomy Browser
links at CSDL, Texas
This Magnoliales-related article is a stub. You can help Wikipedia by expanding it.
degeneria, trematode, genus, species, halosauri, genus, flowering, plants, endemic, fiji, only, genus, family, ceae, system, 2016, unchanged, from, system, 1998, system, 2003, system, 2009, recognizes, this, family, assigns, order, magnoliales, clade, magnolii. For the trematode genus and species see Degeneria halosauri 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 DegeneriaDegeneria vitiensisScientific classificationKingdom PlantaeClade TracheophytesClade AngiospermsClade MagnoliidsOrder MagnolialesFamily DegeneriaceaeI W Bailey amp A C Sm 1 Genus DegeneriaI W Bailey amp A C Sm SpeciesDegeneria roseiflora Degeneria vitiensisDegeneria was named after Otto Degener who first found D vitiensis in 1942 Classical studies of native stands of Degeneria from Vanua Levu and Viti Levu islands were conducted more than 30 years ago 3 4 5 A 45 cent stamp issued in 1988 depicted a flowering branch of Degeneria vitiensis This species appears on Fiji s five dollar bill A one dollar 1988 philatelic commemorated the discovery of Degeneria roseiflora earlier in that same year The genus contains two species of trees both native to Fiji 6 7 Degeneria roseiflora John M Mill Vanua Levu Taveuni karawa Degeneria vitiensis L W Bailey amp A C Sm Viti Levu masiratu Floral structure EditThe stage specific movements of floral organs including scent emissions of degenerias studied by Miller in 1989 are remarkably similar to those observed in other Magnoliales 8 9 10 Further the floral structure of Degeneria is unusual considered to be primitive among the flowering plants 11 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 11 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 11 References Edit 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 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 Miller J M 1988 A new species of Degeneria Degeneriaceae from Fiji Archipelago Journal of the Arnold Arboretum 69 275 280 Miller J M 1988 Puzzling new floral variation in a possible Mesozoic relict flowering plant Fiji Islands P 4 In H J de Blij ed Letters National Geographic Research Volume 4 Washington D C National Geographic Society 144 pp Miller J M 1989 The archaic flowering plant family Degeneriaceae its bearing on an old enigma National Geographic Research 5 2 218 231 Degeneria I W Bailey amp A C Sm Plants of the World Online Royal Botanic Gardens Kew Retrieved 2019 12 27 Smith A C 1991 Degeneriaceae Pp 587 588 In A C Smith Flora Vitiensis Nova Volume 5 Lawai National Tropical Botanical Garden 626 pp Bernhardt P and L B Thien 1987 Self isolation and insect pollination in the primitive angiosperms new evaluations of older hypotheses Plant Systematics and Evolution 156 3 4 159 176 Pang C C and R M K Saunders 2014 The evolution of alternative mechanisms that promote outcrossing in Annonaceae a self compatible family of early divergent angiosperms Botanical Journal of the Linnean Society 174 93 109 Pang C C and R M K Saunders 2015 Floral biology and pollination ecology of Desmos chinensis Annonaceae Assessing the efficacy of floral synchrony for promoting xenogamy International Journal of Plant Sciences 176 4 333 345 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 EditDegeneriaceae in L Watson and M J Dallwitz 1992 onwards The families of flowering plants descriptions illustrations identification information retrieval Version 27 April 2006 https web archive org web 20070103200438 http delta intkey com photograph of a flower and a developing fruit NCBI Taxonomy Browser links at CSDL Texas This Magnoliales related article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Degeneria amp oldid 1062611480, wikipedia, wiki, book, books, library,
