| 词条 | Voanioala |
| 释义 |
|status = CR |status_system = IUCN3.1 |status_ref = [1] |regnum = Plantae |unranked_divisio = Angiosperms |unranked_classis = Monocots |unranked_ordo = Commelinids |ordo = Arecales |familia = Arecaceae |tribus = Cocoseae |genus = Voanioala |genus_authority = J. Dransf. |species = V. gerardii |binomial = Voanioala gerardii |binomial_authority = J. Dransf. }}Voanioala gerardii, commonly known as the forest coconut, is a species of flowering plant in the Arecaceae family. It is a large coconut relative that is generally regarded as monotypic within the genus Voanioala.{{citation needed|date=October 2011}} However a team of geneticists headed by Bee F. Gunn found sufficient genetic variation within Voanioala to constitute at least two and possibly four cryptospecies.[2] It is endemic to Madagascar. It is threatened by habitat loss and harvest for its edible seeds and palm heart, and it is estimated that there are fewer than fifteen mature trees remaining.[1] DescriptionThe forest coconut is a Madagascan tree that can reach 15–20 meters high in the wild. It is supported by a strong root base and its leaves sprouting from the crown can reach up to 5 meters at length. The leaflets are waxy, green, and stiff, and seventy of them can grow from each side of a leaf. The fruit grows in groups at the crown with a thick reddish-brown color. Each seed is up to 2.8 inches (7 cm) long and 1.5 inches (3.5 cm) thick and longitudinally grooved.[3] A scientifically remarkable trait is that each cell has about 600 chromosomes, which is extraordinary for a monocotyledon.[4] DistributionVoanioala gerardii is endemic to Madagascar, and is found in only the Bay of Antongil of the Masoala Peninsula in the northeastern area of the island. It is extremely rare.[1][4]HabitatThe forest coconut is found in the bottom of swampy valleys, as well as slopes in rainforests[4] at an elevation of 200–450 meters above sea level.[5] ConservationVoanioala gerardii is critically endangered because of its scarcity. Only 10-15 trees are found. They are cut down for their edible palm hearts and their seeds are used for market trade. They are also rare because of its poor dispersal of seeds. Habitat loss through agricultural logging threatens forest coconuts as well.[1] The national park in Masoala Peninsula is protecting the forest coconuts on its property, and its future depends greatly on the effort of the national park.[4] Its population is currently decreasing.[1]References1. ^1 2 3 4 {{Cite journal | author = Rakotoarinivo, M. | author2 = Dransfield, J. | last-author-amp = yes | title = Voanioala gerardii | journal = The IUCN Red List of Threatened Species | volume = 2012 | page = e.T38723A2883819 | publisher = IUCN | date = 2012 | url = http://www.iucnredlist.org/details/38723/0 | doi = 10.2305/IUCN.UK.2012.RLTS.T38723A2883819.en | access-date = 15 January 2018}} 2. ^{{cite journal |last= Gunn | first= Bee F. | date= 2004 | title= Phylogeny of Cocoeae (Arecaceae)...etc | journal= Annals of the Missouri Botanical Garden |volume=91 | issue= 3 | page= 509 | jstor= 3298627}} 3. ^Larry R. Noblick in The Palm Journal # 212 (Fall 2016) pp. 12 & 13 Figs 1 & 3. 4. ^1 2 3 {{cite web|title=Forest Coconut|url=http://www.arkive.org/forest-coconut/voanioala-gerardii/|website=arkive.org|accessdate=2015|archive-url=https://web.archive.org/web/20121009142624/http://www.arkive.org/forest-coconut/voanioala-gerardii/|archive-date=2012-10-09|dead-url=yes|df=}} 5. ^{{cite web|title=Voanioala gerardii|url=http://www.virtualherbarium.org/psg/flagship/Voanioala-gerardii.html|website=virtualherbarium.org|accessdate=2015}} External links
5 : Cocoeae|Monotypic Arecaceae genera|Flora of Madagascar|Critically endangered plants|Taxonomy articles created by Polbot |
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