Flora of the Cocos (Keeling) Islands

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North Keeling, a national park North Keeling Island 01.JPG
North Keeling, a national park

The vascular plant flora of the Cocos (Keeling) Islands consists of approximately 61 species native to the 22 vegetated islands and about 69 introduced species, most of which are confined to the two larger inhabited islands, Home Island and West Island. There are no plant species endemic to the islands; however, one variety of Pandanus tectorius , P. tectorius var. cocosensis, [1] is only found growing on these islands. The native vegetation of the two atolls primarily consists of sea-dispersed shoreline plants of the Indo-Pacific region. On the lagoon shoreline, tall shrublands are dominated by Pemphis acidula and Cordia subcordata , often growing in monospecific stands. Closed forest stands are dominated by either Cocos nucifera or Pisonia grandis . [2]

Contents

Much of the area of the southern islands has been modified for coconut plantations, altering the vegetation from the pre-settlement era. North Keeling, about 25 kilometres (16 mi) to the north, has been protected as part of the Pulu Keeling National Park, where 31 plants can be found, of which six are introduced. About half of the species on the southern atoll are introduced. [2] [3]

In a report to Parks Australia in 2002, of the many introduced species on the southern atoll, Chromolaena odorata (Siam weed) was identified as being the greatest threat to the environment. [3] Most of the introduced species are pantropical herbaceous plants likely introduced to the southern atoll after the airfield was built in 1944. [2]

History

The Cocos (Keeling) Islands are isolated, being the only atolls in the eastern Indian Ocean, and were uninhabited until relatively recently in the early 19th century. The first botanical study was done while naturalist Charles Darwin visited the southern atoll for ten days, arriving April 1, 1836. Darwin collected 21 species during his time on the islands. [2]

In such a loose, dry, stony soil, nothing but the climate of the intertropical regions could produce a vigorous vegetation. Besides the Cocoa nut which is so numerous as at first to appear the only tree, there are five or six other kinds. One called the Cabbage tree, grows to a great bulk in proportion to its height, & has an irregular figure; its wood being very soft. Besides these trees the number of native plants is exceedingly limited; I suppose it does not exceed a dozen. Yet the woods, from the dead branches of the trees, & the arms of the Cocoa nuts is a thick jungle.

Charles Darwin, HMS Beagle diary [4]

Later, the Scottish botanist Henry Ogg Forbes botanised the southern islands in 1879, collecting 38 species in 22 days, followed by W. E. Birch in 1885 and the British botanist Henry B. Guppy, who spent ten weeks in 1888 on both atolls. By far the longest visit by a naturalist was that of Frederic Wood Jones who spent 15 months on the southern atoll in 1909 and published his account in the book, Coral and Atolls. A History and Description of the Keeling-Cocos Islands, with an account of their Fauna and Flora, and a Discussion of the Method of Development and Transformation of Coral Structures in General, published in 1912. The northern atoll was visited in 1941 by the British naturalist Carl Alexander Gibson-Hill, who provided the first systematic assessment of the plant communities and a description of the dominant flora. The 1980s saw the two largest surveys in 1985 by I. R. Telford, who collected 93 species from both atolls, and in 1986-1987 by D. G. Williams, who collected 130 from all islands. [2]

Species

Species Family Vernacular name Local nameStatusImage
Dicliptera ciliata Acanthaceaenative
Sesuvium portulacastrum Aizoaceaesea purslanenative Sesuvium p.jpg
Achyranthes aspera var. villosiorAmaranthaceaechaff flowernative Achyranthes aspera at Kadavoor.jpg
Aerva lanata Amaranthaceaeintroduced Aerva lanata in Bhongir AP W I2 IMG 3064.jpg
Crinum asiaticum Amaryllidaceaecrinum lilynative Crinum asiaticum (1).jpg
Zephyranthes rosea Amaryllidaceaeintroduced Zephyranthes rosea1MTFL.jpg
Ochrosia oppositifolia ApocynaceaeKayu Lakinative
Cocos nucifera ArecaceaecoconutKelapanative Coconut green.JPG
Austroeupatorium inulaefolium Asteraceaestinkweedintroduced
Chromolaena odorata AsteraceaeSiam weedintroduced Chromolaena odorata by Ashasathees.jpg
Cyanthillium cinereum Asteraceaeintroduced Cyanthillium cinereum - flower.JPG
Eleutheranthera ruderalis Asteraceaeintroduced
Emilia sonchifolia Asteraceaeintroduced Emilia sonchifolia 4.jpg
Erigeron bonariensis Asteraceaefleabaneintroduced Conyza bonariensis.jpg
Melanthera biflora Asteraceaebeach sunflowernative Wollastonia biflora.jpg
Sonchus oleraceus Asteraceaemilk thistleintroduced Sonchus February 2008-1.jpg
Synedrella nodiflora Asteraceaeintroduced Synedrella nodiflora.jpg
Tridax procumbens Asteraceaeintroduced Coat buttons (Tridax procumbens) in Hyderabad, AP W IMG 7087.jpg
Argusia argentea Boraginaceaeoctopus bushKayu Sirehnative Starr 010520-0073 Tournefortia argentea.jpg
Cordia subcordata Boraginaceaesea trumpetGeronggangnative Cordia subcordata, seeds, flower, leaves.jpg
Lepidium virginicum Brassicaceaeintroduced Lepidium virginicum var pubescens 3.jpg
Caesalpinia bonduc CaesalpiniaceaenickernutKelenchinative Caesalpinia bonduc inflo.jpg
Senna occidentalis Caesalpiniaceaeintroduced Senna occidentalis.jpg
Calophyllum inophyllum CalophyllaceaeAlexandrian laurelNyamplongnative Starr 010309-0546 Calophyllum inophyllum.jpg
Hippobroma longiflora Campanulaceaeintroduced Hippobroma longiflora.jpg
Carica papaya CaricaceaepawpawKatisintroduced Carica papaya 005.JPG
Casuarina equisetifolia subsp. equisetifoliaCasuarinaceaecoastal sheoakCemaranative Casuarina equesitifolia tree.jpg
Cleome gynandra Cleomaceaenative Cleome gynandra Blanco1.233-cropped.jpg
Terminalia catappa Combretaceaesea almondKetapangnative Terminalia catappa (fruit).jpg
Tradescantia spathacea Commelinaceaeintroduced Oyster Plant (Tradescantia spathecea) Vittata Mayflower Faminly (3073341052).jpg
Ipomoea violacea Convolvulaceaemoon flowernative Ipomoea macrantha.jpg
Ipomoea pes-caprae Convolvulaceaegoat's-footKangkong Meryapnative attmp Ipomoea pes-caprae 02.jpg
Bryophyllum pinnatum Crassulaceaeintroduced Starr 070308-5336 Kalanchoe pinnata.jpg
Syringodium isoetifolium Cymodoceaceaesea grassnative Syringodium isoetifolium ployant sous la houle.jpg
Thalassodendron ciliatum Cymodoceaceaesea grassnative
Cyperus bulbosus Cyperaceaenut grassnative
Cyperus javanicus Cyperaceaenative Cyperus javanicus spikelet 1.jpg
Cyperus polystachyos Cyperaceaeintroduced Pycreus.jpg
Fimbristylis cymosa Cyperaceaenative Starr 031108-0022 Fimbristylis cymosa.jpg
Queenslandiella hyalina Cyperaceaenative
Acalypha indica Euphorbiaceaenative Acalypha indica W IMG 4045.jpg
Acalypha lanceolata Euphorbiaceaenative
Euphorbia atoto Euphorbiaceaenative
Euphorbia cyathophora Euphorbiaceaedwarf poinsettiaintroduced Euphorbia cyathophora.jpg
Euphorbia hirta Euphorbiaceaeintroduced Starr 080604-5935 Chamaesyce hirta.jpg
Euphorbia prostrata Euphorbiaceaeintroduced Euphorbia prostrata.jpg
Ricinus communis Euphorbiaceaecastor oil plantPokok Jaru Jarakintroduced Ricinus March 2010-1.jpg
Alysicarpus vaginalis Fabaceaeintroduced Starr 050419-0368 Alysicarpus vaginalis.jpg
Canavalia cathartica Fabaceaesea beannative Canavalia cathartica.jpg
Crotalaria retusa Fabaceaeintroduced 2013.10.31.150923 Rattlepod (Crotalaria retusa) Chain of Craters Road Hawaii Volcanoes National Park Hawaii.jpg
Desmodium triflorum Fabaceaeintroduced Desmodium triflorum at Kadavoor.jpg
Erythrina variegata Fabaceaecoral treeKayu Dedapnative Flower I IMG 3974.jpg
Indigofera hirsuta Fabaceaeintroduced Hairy Indigo (Indigofera hirsuta) (6372953579).jpg
Leucaena leucocephala FabaceaeleucaenaPetehintroduced Leucaena leucocephala.jpg
Macroptilium atropurpureum Fabaceaesiratrointroduced Macroptilium atropurpureum flowers.jpg
Sesbania cannabina Fabaceaeintroduced Sesbania cannabiana 001.jpg
Sesbania grandiflora FabaceaeTuriintroduced akttippuu.jpg
Vigna marina Fabaceaenative Vigna marina (aka beach pea, nanea, notched cowpea) - 02.jpg
Enicostema axillare subsp. littoraleGentianaceaenative
Scaevola taccada Goodeniaceaesea lettuceKayu Kankongnative Scaevola sericea (5187929027).jpg
Hernandia nymphaeifolia Hernandiaceaesea hearseKayu Jambu Hutannative Hernandia nymphaeifolia.jpg
Thalassia hemprichii Hydrocharitaceaesea grassnative
Clerodendrum indicum Lamiaceaeintroduced Starr 060810-8484 Clerodendrum indicum.jpg
Vitex trifolia Lamiaceaenative Vitex trifolia.jpg
Volkameria inermis Lamiaceaesorcerer's flowernative Volkameria inermis 08611.jpg
Cassytha filiformis Lauraceaedevil's twinenative Starr 010520-0082 Cassytha filiformis.jpg
Barringtonia asiatica Lecythidaceaebox fruitKayu Besaginative Barringtonia asiatica (flower).jpg
Pemphis acidula LythraceaeKayu Keritingnative Pemphis acidula bushes.jpg
Hibiscus tiliaceus Malvaceaecotton treePokok Warunative Starr 020803-0107 Hibiscus tiliaceus.jpg
Sida acuta Malvaceaeintroduced Sida acuta (Jangli-methi) in Hyderabad, AP W2 IMG 0084.jpg
Thespesia populnea Malvaceaeportia treeWaru Hutannative Milo closeup.jpg
Triumfetta repens MalvaceaeBingit burrnative
Muntingia calabura MuntingiaceaeBuah Cheriintroduced Singapur cherry (Muntingia calabura) in Hyderabad, AP W IMG 9597.jpg
Eugenia sp.MyrtaceaeJambu Ayerintroduced
Psidium guajava MyrtaceaeguavaJambu Bijiintroduced Psidium guajava flower 26032014 01.jpg
Boerhavia albiflora Nyctaginaceaeintroduced
Boerhavia diffusa Nyctaginaceaeintroduced Boerhavia diffusa in AP W IMG 8081.jpg
Boerhavia repens Nyctaginaceaenative Starr 010520-0067 Boerhavia repens.jpg
Pisonia grandis NyctaginaceaepisoniaAmpolnative Starr 990611-0869 Pisonia grandis.jpg
Ximenia americana Olacaceaeyellow plumRukamnative Ximenia americana leaves & fruit at Chilkur near Hyderabad, AP W2 IMG 7288.jpg
Striga angustifolia Orobanchaceaeintroduced Striga angustifolia.jpg
Pandanus tectorius var. cocosensisPandanaceaescrew palmPandannative
Passiflora foetida var. hispidaPassifloraceaestinking passionflowerintroduced Passionfruit cream.jpg
Turnera ulmifolia Passifloraceaeintroduced YellowAlderKeyWest.JPG
Breynia disticha Phyllanthaceaeintroduced Starr 030612-0049 Breynia disticha.jpg
Phyllanthus amarus Phyllanthaceaenative
Sauropus androgynus PhyllanthaceaeKeretuintroduced Sauropus androgynus at Kadavoor.jpg
Rivina humilis Phytolaccaceaecoral berryintroduced Rivina humilis (fruit).jpg
Scoparia dulcis Plantaginaceaeintroduced Kallurukki.jpg
Apluda mutica Poaceaeintroduced Apluda mutica W IMG 2917.jpg
Bothriochloa bladhii Poaceaeintroduced Bothriochloa bladhii seedhead.jpg
Brachiaria brizantha Poaceaeintroduced
Cenchrus ciliaris Poaceaeintroduced Cenchrus ciliaris.jpg
Cenchrus echinatus Poaceaesand burrintroduced Starr 010520-0041 Cenchrus echinatus.jpg
Chloris barbata Poaceaeintroduced Starr 080611-8522 Chloris barbata.jpg
Chrysopogon aciculatus Poaceaeintroduced Kemucup.jpg
Cynodon dactylon Poaceaecouch grassintroduced Cynodon dactylon 2.jpg
Cynodon radiatus Poaceaeintroduced
Dactyloctenium aegyptium Poaceaeintroduced Dactyloctenium aegyptium, blomme, a, Pretoria.jpg
Desmostachya bipinnata Poaceaeintroduced
Digitaria setigera Poaceaeintroduced
Eleusine indica Poaceaecrowsfoot grassintroduced Eleusine indica, closeup.jpg
Eragrostis amabilis Poaceaeintroduced Starr 080604-6000 Eragrostis amabilis.jpg
Eriochloa meyeriana Poaceaeintroduced
Imperata cylindrica var. majorPoaceaebladey grassintroduced
Ischaemum muticum Poaceaeintroduced
Lepturopetium sp. aff. marshallensePoaceaenative
Lepturus repens Poaceaestalky grassnative Starr 080603-5593 Lepturus repens.jpg
Panicum repens Poaceaeintroduced Starr 050902-4373 Panicum repens.jpg
Paspalum vaginatum Poaceaenative Starr 050418-0245 Paspalum vaginatum.jpg
Sporobolus fertilis Poaceaesand couch grassintroduced Sporobolus fertilis nezuminoo.jpg
Stenotaphrum micranthum Poaceaebeach buffalo grassnative
Thuarea involuta Poaceaebird's-beak grassnative Thuarea involuta kuroiwazasa01.jpg
Zoysia matrella Poaceaenative Zoysia matrella at Peradeniya Botanical Garden.jpg
Unidentified sp.Poaceaeintroduced
Portulaca oleracea Portulacaceaepigweednative Portulaca oleracea.JPG
Rhizophora apiculata Rhizophoraceaespider mangrovenative Thakafathi.JPG
Guettarda speciosa RubiaceaeKembang Melati Hutannative Guettardia2.jpg
Morinda citrifolia RubiaceaecheesefruitMengkudunative Noni fruit (Morinda citrifolia).jpg
Oldenlandia corymbosa Rubiaceaeintroduced Mille Graines. Flattop (1001297322).jpg
Spermacoce remota Rubiaceaeintroduced Spermacoce remota 1.jpg
Triphasia trifolia RutaceaeBuah Kengkitintroduced Triphasia trifoliata fruits.jpg
Allophylus cobbe Sapindaceaenative Allophylus cobbe11.jpg
Dodonaea viscosa Sapindaceaehopbushnative Dodonaea viscosa (Hopbush) W2 IMG 1899.jpg
Physalis minima SolanaceaeChepelokintroduced Physalis minima fruit from Kerala - 20090520.jpg
Solanum americanum Solanaceaeblackberry nightshadeintroduced Starr 010520-0074 Solanum americanum.jpg
Suriana maritima Surianaceaenative Bay Cedar (1001511752).jpg
Laportea aestuans Urticaceaenative
Phyla nodiflora Verbenaceaeintroduced Phyla nodiflora 3 (Corse).JPG
Premna serratifolia Verbenaceaenative Premna serratifolia 13.JPG
Stachytarpheta jamaicensis Verbenaceaeblue snakeweedintroduced Stachytarpheta jamaicensis at Aanakkulam.jpg

See also

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References

  1. Flora of Australia, Vol. 50, Oceanic Islands 2. 1993. p. 7.
  2. 1 2 3 4 5 Williams, D.G. 1994. Vegetation and flora of the Cocos (Keeling) Islands. Atoll Research Bulletin, 404: 1-29.
  3. 1 2 Claussen, J., and D. Slip. 2002. The status of exotic plants on the Cocos (Keeling) Islands, Indian Ocean. Parks Australia North, Department of the Environment. Accessed online: 13 May 2015.
  4. Keynes, Richard. 2001. Charles Darwin's Beagle Diary. Cambridge University Press. pp. 414–415.