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List of endemic plants in the Mariana Islands

From Wikipedia, the free encyclopedia

Micronesia is a biodiversity hotspot with an exceptionally high richness of endemic plant species, 10 times higher than that of Hawaii.[1] The Mariana Islands form an archipelago in the northwest of the Micronesian region.

In 2012, Craig M. Costion and David H. Lorence compiled a list of Micronesian endemic plants, and assessed that the Mariana Islands had 22 endemic plant species (16 species in the southern Mariana Islands, of which 11 were isolated to Guam, and 5 species in the northern Mariana Islands). They concluded that there was an approximately 3% rate of endemism in the Mariana Islands (endemic species per km2), which is comparable to the rates in Hawaii (4%) and Tonga (2%) but lower than the 14% rate of endemism among all Micronesian islands.[1] However, the number of known Marianas endemics has greatly expanded since then with new discoveries, taxonomic revisions, and improvements in digitized databases.

Plants endemic to the Mariana Islands

The following list includes plants that have an endemic range only within the Mariana Islands. "Mariana Islands" is defined in accordance with the World Geographical Scheme for Recording Plant Distributions (WGSRPD), level 3 code "MRN," and includes the following geopolitical territories:

Only species, subspecies, varieties, and forms that are recognized as "accepted" by the Plants of the World Online database are included in this list; synonyms are not include. Some synonyms are listed next to the accepted name if they are still in common use in recent botanical literature. Subspecies are abbreviated "subs.," varieties "var.," and forms "f." after the species name.

The following list of Marianas endemic plants was compiled based on a list generated by Plants of the World Online, last updated in February 2026. This list may not be complete and may not reflect recent changes in taxonomy. An updated list of accepted species for a geographic area can be generated on the Plants of the World Online.[2]

Plants are listed in order by approximate size of their native range, beginning with those with the most restricted native ranges.

More information Image, Scientific name ...
Image Scientific name Chamorro name(s) Order Native distribution Conservation status
 Terminalia rostrata Fosberg & Falanruw[3] Myrtales Asuncion[3]
Leptecophylla mariannensis (Kaneh.) C.M.Weiller[4] Ericales Alamagan[4]
Psychotria hombroniana (Baill.) Fosberg[5]
  • Psychotria hombroniana var. mariannensis (Kaneh.) Fosberg[6]
  • Psychotria hombroniana var. ladronica (Hosok.) Fosberg[7]
  • Psychotria hombroniana var. hombroniana[8]
 Aplokating-palaoan[9] Rubiales Psychotria hombroniana: Marianas, Caroline Islands[5]
  • var. mariannensis: Alamagan[6]
  • var. ladronica (Hosok.) Fosberg: Rota[7]
  • var. hombroniana: Marianas
Osmoxylon mariannense (Kaneh.) Fosberg & Sachet[10] No known common name[11] Apiales Rota[10] Critically endangered (IUCN)[12] Endangered (USFWS)[11]
 Nesogenes rotensis Fosberg & D.R.Herbst[13] No known common name[14] Lamiales Rota[13] Endangered (USFWS)[11]
Derris mariannensis Hosok.[15] Fabales Rota[15]
Psychotria rotensis Kaneh.[16]
  • Psychotria rotensis var. rotensis[17]
 Gentianales Psychotria rotensis: Marianas, Caroline Islands[16]
  • Psychotria rotensis var. rotensis: Rota[17]
 Psychotria rotensis is considered a rare plant on Guam by GPEPP (University of Guam)[18]
Croton saipanensis Hosok.[19] Euphorbiales Saipan[19]
Mucuna pacifica Hosok.[20] Fabales Saipan[20]
Phreatia ladronica Tuyama[21] Asparagales Saipan[21]
Hedyotis scabridifolia Kaneh.[22]
  • Hedyotis scabridifolia var. scabridifolia[23]
  • Hedyotis scabridifolia var. stonei Fosberg[24]
 Gentianales Hedyotis scabridifolia:Marianas[22]
  • var. scabridifolia: Saipan[23]
  • var. stonei: Rota, Guam
Pogostemon guamensis Lorence & W.L.Wagner[25] No known common name Lamiales Guam (northern limestone cliff faces)[25][26] Critically endangered (preliminarily)[26]
 Tinospora homosepala Diels[27] No known common name[14] Ranunculales Guam[27] Endangered (USFWS)[14]
 Hedyotis megalantha Merr.[28] Paudedo[14] Gentianales Guam[28] Endangered (USFWS)[14]
 Eugenia bryanii Kaneh.[29] No known common name[14] Myrtales Guam[29] Endangered (USFWS)[14]
Psychotria malaspinae Merr.[30] Aplokating-palaoan[14] Gentianales Guam[30] Endangered (USFWS)[14]
Elatostema divaricatum (Gaudich.) Fosberg[31] Rosales Guam[31]
Elatostema stenophyllum Merr.[32] Rosales Guam[32]
Dianella saffordiana Fosberg & Sachet[33] Asparagales Guam[33]
Potamogeton marianensis Cham. & Schltdl.[34] Alismatales Guam[34]
Psychotria andersonii Fosberg[35] Gentianales Guam[35]
Digitaria gaudichaudii (Kunth) Henrard[36] Poales Guam[36]
Schleinitzia fosbergii Nevling & Niezgoda[37] Fabales Guam[37]
Allophylus holophyllus Radlk.[38] Nget[9] Ericales Guam[38]
Rhaphidophora guamensis P.C.Boyce[39] Araceae Guam[39]
Timonius nitidus (Bartl. ex DC.) Fern.-Vill.[40] Maholoc layu[9] Gentianales Guam[40]
Syzygium guamense Byng[41] Myrtales Guam[41]
Bulbophyllum raulersoniae Deloso, Paulino & Cootes[42] Asparagales Guam[42] Proposed by Deloso et al. to be listed as endangered[43]
Peperomia mariannensis f. saipana (C.DC.) Fosberg[44] Piperales Tinian, Saipan (forma saipana) (the species Peperomia mariannensis is endemic to the Marianas and Palau)[45]
Crepidium alamaganense (S.Kobay.) T.Yukawa[46]

(synonym: Malaxis alamaganensis)

 Asparagales Northern Marianas[46]
Dendrobium oblongimentum Hosok. & Fukuy.[47] Asparagales Guam (northern), Rota[47]
Serianthes nelsonii Merr.[48] Håyun lågu (Guam)

Trongkon guåfi (Rota)[14]

 Fabales Guam, Rota[48] Endangered (USFWS)[11]
 Bulbophyllum guamense Ames[49] Siboyas hålom tåno[14] Asparagales Guam, Rota[49] Threatened (USFWS)[14]
 Thelypteris gretheri (W.H.Wagner) B.C.Stone[50]

(synonym: Cyclosorus gretheri)

 Polypodiales Guam, Rota[50]
Thelypteris guamensis (Holttum) Fosberg & Sachet[51] (synonym: Cyclosorus guamensis) Polypodiales Guam, Rota[51]
Tabernaemontana rotensis (Kaneh.) B.C.Stone[52] (considered by POWO to be a synonym of the more widespread Tabernaemontana pandacaqui[53] although it was determined by USFWS, using genetic analysis, to be a distinct species.[54] No known common name[14] Gentianales Guam, Rota[54] Threatened (USFWS) (Tabernaemontana rotensis)[14]
 Syzygium thompsonii[55] Atoto[9] Myrtales Guam, Rota, Saipan[55]
Dischidia puberula Decne.[56] Gentianales Guam, Rota, Saipan[56]
Solanum guamense Merr.[57] Berenghenas halomtano[14] Solanales Marianas[57] Endangered (USFWS)[14]
 Phyllanthus saffordii Merr.[58] No known common name[58] Malpighiales Marianas[58] Endangered (USFWS)[14]
Hedyotis laciniata Kaneh.[59] Gentianales Marianas[59] Considered a rare plant on Guam by GPEPP (University of Guam)[60]
Claoxylon marianum Müll.Arg.[61] Katot[9] Malpighiales Marianas[61] Considered a rare plant on Guam by GPEPP (University of Guam)[62]
Nervilia jacksoniae Rinehart & Fosberg[63] No known common name[14] Asparagales Marianas[63] Threatened (USFWS)[11]
 Maesa walkeri Fosberg & Sachet[64] No known common name[14] Ericales Marianas[64] Threatened (USFWS)[11]
 Dendrobium guamense Ames[65] No known common name[14] Asparagales Marianas[65] Threatened (USFWS)[14]
Trachoma guamense (Ames) Garay (synonym: Tuberolabium guamense)[66] No known common name[14] Asparagales Marianas[66] Threatened (USFWS)[14]
Canavalia megalantha Merr.[67] Fabales Marianas[67]
Jasminum marianum DC.[68] Banago[9] Lamiales Marianas[68]
Eugenia palumbis Merr.[69] Agatelang[9] Myrtales Marianas[69]
Drypetes dolichocarpa Kaneh.[70](synonym: Drypetes rotensis) Mwelel[71] Malpighiales Marianas[70]
Macaranga thompsonii Merr.[72] Pengua[9] Malpighiales Marianas[72]
Ochrosia mariannensis A.DC.[73]
  • Ochrosia mariannensis var. mariannensis[74]
  • Ochrosia mariannensis var. crassicarpa Fosberg & Falanruw[75]
 Langiti[76] Gentianales Marianas[73]
  • var. mariannensis (Marianas)[74]
  • var. crassicarpa (Saipan)[75]
Discocalyx megacarpa Merr.[77] Otot[9] Ericales Marianas[77]
Discocalyx ladronica Mez[78] Ericales Marianas[78]
Piper guahamense C.DC.[79] Pupúlu aniti[9] Piperales Marianas[79]
Piper salicinum Opiz[80] Piperales Marianas[80]
Ischaemum longisetum Merr.[81] Poales Marianas[81]
Cyrtandra agrihanensis Ohba[2] Lamiales Marianas[2]
Premna mariannarum Schauer[82] Lamiales Marianas[82]
Premna paulobarbata H.J.Lam[83] Lamiales Marianas[83]
Corchorus tiniannensis Hosok.[84] Malvales Marianas[84]
Grammatophyllum schmidtianum Schltr.[85] Asparagales Marianas[85]
Bikkia longicarpa Valeton[86] Gentianales Marianas[86]
Allophylus laetus Radlk.[87] Sapindales Marianas[87]
Tarenna sambucina var. glabra (Merr.) Fosberg & Sachet[88] Smagdara[9] Gentianales Marianas[88]
Callicarpa lamii Hosok.[89] Lamiales Marianas[89] (Guam, Rota, Aguiguan, Tinian, Saipan, Alamagan, Pagan, Agrihan)
Callicarpa candicans var. paucinervia (Merr.) Fosberg[90] Hamlag[9] Lamiales Marianas[90]
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Plants endemic to the Pacific islands, including the Mariana Islands

The following list includes plants that are native to the Marianas but have a broader native range in Micronesia or the Pacific islands. Plants with native ranges into the Asian continent are not included.

Only species or subspecies that are recognized as "accepted" by the Plants of the World Online database are included in this list (synonyms are not include). Some synonyms are listed with the accepted name if they are still in common use in recent botanical literature. This list is not complete and may not reflect recent changes in taxonomy. An updated and complete list can be generated on the Plants of the World Online.[2]

Plants are listed roughly in order by size of their native range, beginning with plants with the most restricted native ranges.

More information Image, Scientific name ...
Image Scientific name Chamorro name(s) Order Native Distribution Conservation status
Phreatia thompsonii Ames[91] Asparagales Guam, Pohnape[91]
Meryta senfftiana Volkens[92] Apiales Saipan to Caroline Islands[92]
Phyllanthus marianus Müll.Arg.[93] Gaogao uchan[9] Malpighiales Marianas to Caroline Islands (Ulithi)[93]
Psychotria mariana Bartl. ex DC.[94] Aplokating[9] Gentianales Marianas to Caroline Islands (Fais)[94]
Ixora triantha Volkens[95] Guaguat[96] Gentianales Marianas, Caroline Islands (Yap)[95]
Elaeocarpus joga Merr.[97] Yoga[9] Oxalidales Marianas, Caroline Islands (Palau)[97]
Zeuxine fritzii Schltr.[98] Asparagales Marianas, Caroline Islands (Palau)[98]
Zeuxine ovata (Gaudich.) Garay & W.Kittr.[99] Asparagales Marianas, Caroline Islands (Palau)[99]
Artocarpus mariannensis Trécul[100] Dugdug[9] Rosales Marianas to Caroline Islands (Palau)[100]
Heritiera longipetiolata Kaneh.[101] Ufa hålom tåno'[14] Malvales Marianas to Caroline Islands (Pohnpei)[101] Endangered (USFWS)[14]
 Phyllanthus mariannensis Müll.Arg.[102] (synonym: Glochidion marianum)[103] Chosgu[104] Malpighiales Guam and Caroline Islands[103]
Taeniophyllum marianense Schltr.[105] Asparagales Marianas, Caroline Islands[105]
Hedyotis fruticulosa (Volkens) Merr.[106] Gentianales Marianas, Caroline Islands[106]
(Photo not from the Marianas)
 Ficus microcarpa var. saffordii (Merr.) Corner[107] Nunu

(same common name as Ficus prolixa)[9]

 Rosales Marianas, Caroline Islands[107]
Tephrosia mariana DC.[108] Fabales Marianas, Caroline Islands[108]
Sporobolus farinosus Hosok.[109] Poales Marianas, Caroline Islands[109]
Coelogyne guamensis Ames[110] Asparagales Marianas, Caroline Islands[110]
Thelypteris maemonensis (W.H.Wagner & Grether) B.C.Stone[111] (synonym: Cyclosorus maemonensis) Polypodiales Marianas, Caroline Islands[111]
Elatostema calcareum Merr.[112] Tupun ayuyu[113] Rosales Marianas, Caroline Islands[112]
Xylosma nelsonii Merr.[114] Malpighialies Marianas, Caroline Islands[114]
Gymnosporia thompsonii Merr.[115] (synonym: Maytenus thompsonii) Luluhot[9] Celastrales Marianas to Caroline Islands[115]
Aglaia mariannensis Merr.[116] Mapuñao[9] Sapindales Marianas to Caroline Islands[116]
(Photo may not be from the Marianas)
 Melastoma malabathricum var. mariannum (Naudin) Fosberg & Sachet[117] Gafao[9] Myrtales Marianas, Caroline Islands[117]
Sphaeropteris aramaganensis (Kaneh.) R.M.Tryon[118] Cyatheales South Kazan-retto to Marianas[118]
Digitaria mezii Kaneh.[119] Poales Marianas, New Guinea[119]
Cycas micronesica K.D.Hill[120] Fadang[14] Cycadales Marianas, Caroline Islands, Marshall Islands)[120] Endangered (IUCN); Threatened (USFWS)[14]
 Melochia villosissima (C.Presl) Merr.[121] Sayåfii[122] Malvales Kazan-retto (Minami-Iōtō) to northwestern Pacific (Caroline Is., Marianas)[121]
Myoporum boninense Koidz.[123] Lamiales Ogasawara-shoto, Marianas, New South Wales
(Photo not from the Marianas)
 Ixora casei Hance[124] Gentianales Northwest Pacific to Gilbert Islands (Caroline Is., Gilbert Is., Marianas, Marshall Is.)[124]
Dendrocnide latifolia (Gaudich.) Chew[125] Kahtat[9] Rosales Solomon Islands to W. Pacific (Caroline Is., Marianas, New Caledonia, Solomon Is., Vanuatu)[125]
Freycinetia reineckei Warb.[126] Fianiti[122] Pandanales Western Pacific (Caroline Is., Marianas, Samoa, Vanuatu)[126]
Myrtella bennigseniana (Volkens) Diels[127] Myrtales Marianas, Caroline Is., New Guinea[127]
Hernandia labyrinthica Tuyama[128] Laurales Marianas, New Guinea, Solomon Is.[128]
Medinilla medinillana (Gaudich.) Fosberg & Sachet[129] Myrtales Sulawesi, Maluku New Guinea, and Marianas[129]
Leptopetalum foetidum (G.Forst.) Neupane & N.Wikstr.[130] Gentianales Cook Is., Fiji, Marianas, New Caledonia, Niue, Samoa, Tonga, Tubuai Is., Vanuatu[130]
(Photo not from the Marianas)
 Vitex cofassus Reinw. ex Blume Lamiaceae Bismarck Archipelago, Caroline Is., Maluku, Marianas, New Guinea, Solomon Is., Sulawesi[131]
Ficus prolixa G.Forst. Nunu

(same common name as Ficus microcarpa var. microcarpa)[9]

 Moraceae Caroline Is., Cook Is., Fiji, Gilbert Is., Line Is., Marianas, Marquesas, Nauru, New Caledonia, Niue, Pitcairn Is., Samoa, Society Is., Tonga, Tuamotu, Tubuai Is., Tuvalu, Vanuatu, Wallis-Futuna Is.[132]
(Photo not from the Marianas)
 Eugenia reinwardtiana (Blume) DC.[133] A'abang Myrtales Jawa (Kangean Island) to Pacific (Borneo, Caroline Is., Cook Is., Fiji, Hawaii, Jawa, Lesser Sunda Is., Maluku, Marianas, Marquesas, New Guinea, Niue, Pitcairn Is., Queensland, Samoa, Society Is., Tonga, Tuamotu, Tubuai Is., Vanuatu, Western Australia)[133]
Merrilliodendron megacarpum (Hemsl.) Sleumer[134] Faniok[9] Icacinales Philippines to W. Pacific (Bismarck Archipelago, Caroline Is., Marianas, New Guinea, Philippines, Santa Cruz Is., Solomon Is., Sulawesi, Vanuatu)[134]
Capparis spinosa subsp. cordifolia (Lam.) Fici[135]

(synonym: Capparis mariana)

 Atkåpares Brassicales Central Malesia to western and southern Pacific (Caroline Is., Cook Is., Fiji, Lesser Sunda Is., Marianas, Marshall Is., Nauru, New Caledonia, New Guinea, Niue, Philippines, Pitcairn Is., Samoa, Society Is., Solomon Is., Tonga, Tuamotu, Tubuai Is., Vanuatu, Wallis-Futuna Is.)[135]
(Specimen not from the Marianas)
 Grewia prunifolia A.Gray[136] Agilau[9] Malvales Cook Is., Fiji, Marianas, New Caledonia, Niue, Samoa, Society Is., Tonga, Tuamotu, Tubuai Is., Vanuatu, Wallis-Futuna Is.[136]
(Specimen not from the Marianas)
 Gynochthodes myrtifolia (synonym: Morinda umbellata var. glandulosa (Merr.) Fosberg)[137] Gentianales G. myrtifolia: western and southern Pacific (Caroline Is., Cook Is., Fiji, Marianas, Marquesas, New Caledonia, Niue, Pitcairn Is., Samoa, Society Is., Tonga, Tuamotu, Tubuai Is., Vanuatu, Wallis-Futuna Is.)[137] Considered a rare plant on Guam by GPEPP (University of Guam) (listed as Morinda umbellata)[138]
(Photo not from the Marianas)
 Heliotropium anomalum Hook. & Arn.[139] Boraginales Caroline Is., Cook Is., Hawaii, Line Is., Marianas, New Caledonia, Niue, Pitcairn Is., Society Is., Tuamotu, Tubuai Is., Wake I.[139]
Geniostoma rupestre var. glaberrimum (Benth.) B.J.Conn[140] Måhlok håyu

Anasser[9]

 Gentianales Solomon Islands to western and southern Pacific (Caroline Is., Fiji, Marianas, New Caledonia, Niue, Pitcairn Is., Samoa, Santa Cruz Is., Society Is., Tonga, Tubuai Is., Vanuatu, Wallis-Futuna Is.)[140]
(Specimen not from the Marianas)
 Solanum repandum G.Forst.[141] (synonym: Solanum mariannense) Solanales Bismarck Archipelago, Cook Is., Fiji, Marianas, Marquesas, Niue, Pitcairn Is., Society Is., Vanuatu[141] (Solanum mariannense previously reported to be endemic to Rota)[1]
Sphaeropteris lunulata (G.Forst.) R.M.Tryon (often listed as its synonym, Cyathea lunulata (G.Forst.) Copel.[142] Chacha[9] Cyatheales Bismarck Archipelago to western Pacific (Bismarck Archipelago, Caroline Is., Fiji, Marianas, Samoa, Santa Cruz Is., Solomon Is., Sulawesi, Tonga, Vanuatu, Wallis-Futuna Is.)[143] Cyathea lunulata (synonymous name) is considered a rare plant on Guam by GPEPP (University of Guam)[144]
 Cocos nucifera L.[145] Niyok (coconut) Arecales Central Malesia to SW. Pacific (Bismarck Archipelago, Maluku, New Guinea, Philippines, Queensland, Samoa, Santa Cruz Is., Solomon Is., Tonga, Vanuatu)[145]
Bikkia tetrandra (L.f.) A.Rich.[146] Gausali[9] Gentianales New Guinea to western Pacific (Caroline Is., Fiji, Marianas, New Caledonia, New Guinea, Niue, Solomon Is., Tonga, Vanuatu, Wallis-Futuna Is.)[146]
Polyscias macgillivrayi (Benth.) Harms[147]

Synonym: Polyscias grandifolia

 Pepega[9] Apiales New Guinea to western Pacific (Bismarck Archipelago, Caroline Is., Gilbert Is., Marianas, New Guinea, Queensland, Santa Cruz Is., Solomon Is.)[147]
Meiogyne cylindrocarpa (Burck) Heusden[148] Paipai[9] Magnoliales Malesia to Marianas and N. Australia (Borneo, Jawa, Marianas, New Guinea, Northern Territory, Philippines, Queensland, Vanuatu, Western Australia)[148]
(Photo not from the Marianas)
 Paratrophis pendulina (Endl.) E.M.Gardner[149] (synonym: Streblus pendulinus)[150] Rosales E. New Guinea to E. Australia and Pacific (Caroline Is., Fiji, Hawaii, Marianas, New Caledonia, New Guinea, New South Wales, Norfolk Is., Queensland, Tubuai Is., Vanuatu)[149]
(Photo not from the Marianas)
 Psydrax odoratus subsp. odoratus[151] Gentianales Caroline Is., Fiji, Hawaii, Marianas, Marquesas, New Caledonia, New Guinea, Pitcairn Is., Society Is., Tonga, Tuamotu, Tubuai Is., Vanuatu[152]
(Photo not from the Marianas)
 Schoenus maschalinus Roem. & Schult. Cyperaceae Chatham Is., Marianas, New Guinea, New South Wales, New Zealand North, New Zealand South, Philippines, Queensland, South Australia, Sumatera, Tasmania, Victoria[153]
Tristiropsis acutangula[154][155]

(synonym, Tristiropsis obtusangula)[156]

 Fai'a[9] Sapindales Bismarck Archipelago, Borneo, Caroline Is., Christmas I., Jawa, Lesser Sunda Is., Maluku, Marianas, New Guinea, Philippines, Queensland, Solomon Is., Sulawesi[157]
(Specimen not from the Marianas)
 Trichomanes atrovirens (C.Presl) Kunze Hymenophyllaceae Bismarck Archipelago, Caroline Is., Maluku, Nansei-shoto, New Guinea, New South Wales, Norfolk Is., Philippines, Queensland, Santa Cruz Is., Solomon Is., Sulawesi, Vanuatu[158]
(Photo not from the Marianas)
 Fagraea berteroana A.Gray ex Benth.[159] Gentianales Papuasia to Pacific (Bismarck Archipelago, Caroline Is., Cook Is., Fiji, Gilbert Is., Marianas, Marquesas, Nauru, New Caledonia, New Guinea, Niue, Queensland, Samoa, Society Is., Solomon Is., Tonga, Tubuai Is., Vanuatu, Wallis-Futuna Is.)[159]
(Photo not from the Marianas)
 Asplenium laserpitiifolium Lam.[160] Polypodiales Nansei-shoto to Malesia and Pacific (Bismarck Archipelago, Caroline Is., Fiji, Kazan-retto, Lesser Sunda Is., Maluku, Marianas, Marquesas, Nansei-shoto, New Caledonia, New Guinea, Niue, Ogasawara-shoto, Philippines, Queensland, Samoa, Society Is., Solomon Is., Sulawesi, Tonga, Tubuai Is., Vanuatu, Wallis-Futuna Is.)[160] Considered a rare plant on Guam by GPEPP (University of Guam)
(Photo not from the Marianas)
 Alyxia stellata (J.R.Forst. & G.Forst.) Roem. & Schult.[161] Lodosong lahe

Nanago[9]

 Gentianales Northeast Queensland to Pacific (Caroline Is., Cook Is., Fiji, Hawaii, Marianas, Marquesas, New Caledonia, Niue, Pitcairn Is., Queensland, Samoa, Society Is., Solomon Is., Tonga, Tuamotu, Tubuai Is., Vanuatu, Wallis-Futuna Is.)[161]
(Photo not from the Marianas)
 Pandanus tectorius Parkinson[162] Kafo

Aggag[9]

 Pandanales Philippines to Pacific and eastern Australia (Bismarck Archipelago, Caroline Is., Cocos (Keeling) Is., Cook Is., Fiji, Gilbert Is., Hawaii, Jawa, Lesser Sunda Is., Line Is., Maluku, Marianas, Marquesas, Marshall Is., Nauru, New Caledonia, New Guinea, New South Wales, Niue, Philippines, Pitcairn Is., Queensland, Samoa, Santa Cruz Is., Society Is., Solomon Is., Tokelau-Manihiki, Tonga, Tuamotu, Tubuai Is., Tuvalu, Vanuatu, Wake I., Wallis-Futuna Is.)[162]
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Plants formerly considered or currently proposed to be endemic to the Mariana Islands

The following list includes select species or variants that have previously been considered endemic to the Mariana Islands, and may still be listed as such in certain publications, but are not considered to be valid species according to the Plants of the World Online database. Also included here are species that have more recently been proposed to be distinct species or subspecies, but have not yet been accepted.

More information Scientific name, Chamorro name(s) ...
Scientific name Chamorro name(s) Order Native Distribution Conservation status
Korthalsella species (unnamed species presented at Micronesia Terrestrial Conservation Conference)[163] Santalales
Zehneria guamensis (Merr.) Fosberg[164] Ahgaga[165] Cucurbitales Despite its species name, it is listed as native to China South-Central, China Southeast, Marianas, Nansei-shoto, Taiwan.[164] However, it is elsewhere described as a Marianas endemic.[166][167][168] Considered a rare plant on Guam by GPEPP (University of Guam)[165]
Carallia tulasnei Baill (unplaced name)[169] Malpighiales Marianas
Melanolepis multiglandulosa var. glabrata (Müll.Arg.) Fosberg[170] (now considered a synonym of the more widespread Melanolepis multiglandulosa (Reinw. ex Blume) Rchb. & Zoll.) Ålom[171] Malpighiales Melanolepis multiglandulosa var. glabrata (previously reported to be endemic to the Marianas[170])

Melanolepis multiglandulosa (S. Indo-China to Nansei-shoto and NW. Pacific, including Marianas)
Ceratopteris gaudichaudii Brongn. (now considered a synonym of the pan-tropical Ceratopteris thalictroides (L.) Brongn.)[172] Polypodiales Ceratopteris gaudichaudii:

Ceratopteris thalictroides: pan-tropical/subtropical[173]
Cerbera dilatata Markgr.[174] (now considered a synonym of Cerbera odollam Gaertn.)[175] Chiute[176] Gentianales Cerbera dilatata: previously listed as a Marianas endemic[71]

Cerbera odollam: South India to Pacific[175]
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