Endemics in Family Order

Acanthaceae
Hemigraphis pacifica
Pseuderanthemum inclusum
Pseuderanthemum palauense

Anacardiaceae
Buchanania palawensis

Annonaceae
Goniothalamus carolinensis
Polyalthia merrillii

Apocynaceae
Melodinus insularis
Rauvolfia insularis

Araliaceae
Osmoxylon oliveri
Osmoxylon pachyphyllum
Osmoxylon truncatum

Arecaceae
Heterospathe elata var palauensis
Hydriastele palauensis
Ponapea palauensis

Boraginaceae
Cordia micronesica

Burmanniaceae
Gymnosiphon okamotoi

Capparaceae
Capparis carolinensis

Celastraceae
Maytenus palauica

Clusiaceae
Calophyllum inophyllum var wakamatsui
Calophyllum pelewense
Garcinia matsudai
Garcinia rumiyo var calcicola
Kayea pacifica

Combretaceae
Terminalia crassipes

Cucurbitaceae
Trichosanthes hosokawae

Cyperaceae
Fimbristylis palauensis
Hypolytrum flavinux

Ebenaceae
Diospyros ferrea var palauensis

Elaeocarpaceae
Elaeocarpus rubidus

Euphorbiaceae
Acalypha amentacea var heterotricha
Acalypha amentacea var palauensis
Claoxylon longiracemosum
Cleidion sessile

Fabaceae
Crudia cynometroides
Dalbergia hosokawae
Dalbergia palauensis
Parkia parvifoliola
Serianthes kanehirae var kanehirae

Gentianaceae
Fagraea berteroana var galilai
Fagraea ksid

Gesnariaceae
Cyrtandra palawensis
Cyrtandra todaiensis

Lomariopsidaceae
Cyclopeltis kingii

Malvaceae
Sterculia palauensis
Trichospermum ledermannii

Melastomataceae
Astronidium palauense
Medinilla blumeana

Myristicaceae
Horsfieldia palauensis

Myrsinaceae
Discocalyx mezii
Discocalyx palauensis
Maesa palauensis
Myrsine palauensis

Myrtaceae
Syzygium palauensis

Olacaceae
Anacolosa glochidiiformis

Orchidaceae
Aglossorrhyncha micronesiaca
Agrostophyllum palawense
Bulbophyllum desmanthum
Bulbophyllum hatusimanum
Chiloschista loheri
Cleisostoma porrigens
Crepidium calcarea
Crepidium kerstingiana
Crepidium palawensis
Crepidium setipes
Cystorchis ogurae
Dendrobium brachyanthum
Dendrobium implicatum
Dendrobium kerstingianum
Dendrobium palawense
Dendrobium patentifiliforme
Dipodium freycinetioides
Liparis dolichostachya
Liparis palawensis
Liparis yamadae
Micropera draco
Moerenhoutia laxa
Nervilia trichophylla
Oberonia palawensis
Peristylus palawensis
Phreatia kanehirae
Phreatia palawensis
Robiquetia palawensis
Taeniophyllum palawense
Zeuxine palawensis
Zeuxine palawensis var variegata

Pandanaceae
Freycinetia villalobosii
Pandanus aimiriikensis
Pandanus kanehirae
Pandanus lorencei
Pandanus macrojeanneretia
Pandanus palawensis
Pandanus peliliuensis

Phyllanthaceae
Cleistanthus carolinianus
Cleistanthus insularis
Glochidion macrosepalum
Glochidion palauense
Glochidion websteri
Phyllanthus palauensis
Phyllanthus rupi-insularis

Piperaceae
Peperomia kraemeri
Peperomia palauensis
Peperomia palauensis var occidentalis
Piper hosokawae

Poaceae
Panicum palauense
Paspalum orbiculare var otobedii
Pschaemum polystachyum var chordatum

Polypodiaceae
Oreogrammitis palauensis
Prosaptia palauensis

Pteridaceae
Adiantum palaoense
Pteris tapeinidiifolia

Putranjivaceae
Drypetes nitida

Rhamnaceae
Ventilago nisidai

Rubiaceae
Badusa palauensis
Bikkia palauensis
Hedyotis aimiriikensis
Hedyotis cornifolia
Hedyotis divaricata var divaricata
Hedyotis korrorensis
Hedyotis sachetiana
Hedyotis suborthogona
Hedyotis tomentosa
Hedyotis tuyamae
Maesa canfieldiae
Morinda latibractea
Morinda pedunculata
Ophiorrhiza palauensis
Psychotria cheathamiana
Psychotria diospyrifolia
Psychotria hombroniana var canfieldiae
Psychotria hombroniana var peliliuensis
Psychotria mycetoides
Psychotria rotensis var palauensis
Timonius corymbosus
Timonius corymbosus var takamatsui
Timonius korrensis
Timonius mollis
Timonius mollis var submollis
Timonius mollis var villosissimus
Timonius salsedoi
Timonius subauritus
Timonius subauritus var strigosus
Uncaria lanosa var korrensis

Rutaceae
Melicope palawensis
Melicope trichantha

Salicaceae
Casearia hirtella

Sapindaceae
Elattostachys palauensis

Sapotaceae
Manilkara udoido
Planchonella calcarea

Scrophulariaceae
Limnophila fragrans var brevis

Sellaginellaceae
Selaginella dorsicola
Selaginella palauensis
Selaginella pseudo-volkensii

Symplocaceae
Symplocos racemosa var palauensis

Thelypteridaceae
Cyclosorus carolinensis
Cyclosorus perglandulifera
Cyclosorus rupicola

Urticaceae
Elatostema stoloniforme
Pipturus micronesicus

Vitaceae
Cayratia palauana


Endemics in Alphabetical Order

Acalypha amentacea var heterotricha
Acalypha amentacea var palauensis
Adiantum palaoense
Aglossorrhyncha micronesiaca
Agrostophyllum palawense
Anacolosa glochidiiformis
Astronidium palauense
Badusa palauensis
Bikkia palauensis
Buchanania palawensis
Bulbophyllum desmanthum
Bulbophyllum hatusimanum
Calophyllum inophyllum var wakamatsui
Calophyllum pelewense
Capparis carolinensis
Casearia hirtella
Cayratia palauana
Chiloschista loheri
Claoxylon longiracemosum
Cleidion sessile
Cleisostoma porrigens
Cleistanthus carolinianus
Cleistanthus insularis
Cordia micronesica
Crepidium calcarea
Crepidium kerstingiana
Crepidium palawensis
Crepidium setipes
Crudia cynometroides
Cyclopeltis kingii
Cyclosorus carolinensis
Cyclosorus perglandulifera
Cyclosorus rupicola
Cyrtandra palawensis
Cyrtandra todaiensis
Cystorchis ogurae
Dalbergia hosokawae
Dalbergia palauensis
Dendrobium brachyanthum
Dendrobium implicatum
Dendrobium kerstingianum
Dendrobium palawense
Dendrobium patentifiliforme
Diospyros ferrea var palauensis
Dipodium freycinetioides
Discocalyx mezii
Discocalyx palauensis
Drypetes nitida
Elaeocarpus rubidus
Elatostema stoloniforme
Elattostachys palauensis
Fagraea berteroana var galilai
Fagraea ksid
Fimbristylis palauensis
Freycinetia villalobosii
Garcinia matsudai
Garcinia rumiyo var calcicola
Glochidion macrosepalum
Glochidion palauense
Glochidion websteri
Goniothalamus carolinensis
Gymnosiphon okamotoi
Hedyotis aimiriikensis
Hedyotis cornifolia
Hedyotis divaricata var divaricata
Hedyotis korrorensis
Hedyotis sachetiana
Hedyotis suborthogona
Hedyotis tomentosa
Hedyotis tuyamae
Hemigraphis pacifica
Heterospathe elata var palauensis
Horsfieldia palauensis
Hydriastele palauensis
Hypolytrum flavinux
Kayea pacifica
Limnophila fragrans var brevis
Liparis dolichostachya
Liparis palawensis
Liparis yamadae
Maesa canfieldiae
Maesa palauensis
Manilkara udoido
Maytenus palauica
Medinilla blumeana
Melicope palawensis
Melicope trichantha
Melodinus insularis
Micropera draco
Moerenhoutia laxa
Morinda latibractea
Morinda pedunculata
Myrsine palauensis
Nervilia trichophylla
Oberonia palawensis
Ophiorrhiza palauensis
Oreogrammitis palauensis
Osmoxylon oliveri
Osmoxylon pachyphyllum
Osmoxylon truncatum
Pandanus aimiriikensis
Pandanus kanehirae
Pandanus lorencei
Pandanus macrojeanneretia
Pandanus palawensis
Pandanus peliliuensis
Panicum palauense
Parkia parvifoliola
Paspalum orbiculare var otobedii
Peperomia kraemeri
Peperomia palauensis
Peperomia palauensis var occidentalis
Peristylus palawensis
Phreatia kanehirae
Phreatia palawensis
Phyllanthus palauensis
Phyllanthus rupiinsularis
Piper hosokawae
Pipturus micronesicus
Planchonella calcarea
Polyalthia merrillii
Ponapea palauensis
Prosaptia palauensis
Pschaemum polystachyum var chordatum
Pseuderanthemum inclusum
Pseuderanthemum palauense
Psychotria cheathamiana
Psychotria diospyrifolia
Psychotria hombroniana var canfieldiae
Psychotria hombroniana var peliliuensis
Psychotria mycetoides
Psychotria rotensis var palauensis
Pteris tapeinidiifolia
Rauvolfia insularis
Robiquetia palawensis
Selaginella dorsicola
Selaginella palauensis
Selaginella pseudo-volkensii
Serianthes kanehirae var kanehirae
Sterculia palauensis
Symplocos racemosa var palauensis
Syzygium palauensis
Taeniophyllum palawense
Terminalia crassipes
Timonius corymbosus
Timonius corymbosus var takamatsui
Timonius korrensis
Timonius mollis
Timonius mollis var submollis
Timonius mollis var villosissimus
Timonius salsedoi
Timonius subauritus
Timonius subauritus var strigosus
Trichosanthes hosokawae
Trichospermum ledermannii
Uncaria lanosa var korrensis
Ventilago nisidai
Zeuxine palawensis
Zeuxine palawensis var variegata


Summary

Included here is Palau - a group of over 250 islands forming the western chain of the Caroline Islands. These form part of the larger island group of Micronesia.

Of the endemic vascular plants so far recorded there are about 178 species and varieties in 99 genera and 47 families but no endemic genera. This list has recently been revised by Costion & Lorence (2012).

References

Costion, C. 2009. New and Noteworthy Plant Records from Palau: An Annotated Checklist. Micronesica, 41: 1-18.

Costion, C. M., Kitalong, A. H. & Holm, T. 2009. Plant Endemism, Rarity, and Threat in Palau, Micronesia: A Geographical Checklist and Preliminary Red List Assessment. Micronesica, 41: 131–164.

Costion, C. M. & Lorence, D. H. 2012. The Endemic Plants of Micronesia: A Geographical Checklist and Commentary. Micronesica, 43: 51-100.

Endress, B. A. 2002. The importance of endemic species to forest succession in Palau. Micronesica, 34: 141-153.

Fosberg, F. R., Sachet, M. H. & Oliver, R. 1979. A Geographical Checklist of the Micronesian Dicotyledonae. Micronesica, 15: 41-295.

Fosberg, F. R. 1984. Phytogeographic comparison of Polynesia and Micronesia. In: Biogeography of the Tropical Pacific (Proceedings of a Symposium). Eds. F. J. Radovsky, P. H. Raven and H. Sohmer. Bishop Museum Special Publication No. 72.

Kitalong, H. A., R. A. DeMeo, T. Holm, C. Costion, D. Lorence & T. Flynn. 2008. Plants of Palau: provisional checklist of the vascular plants of Palau with habitat, form, status, and Palauan names. In: A Field Guide to Native Trees of Palau eds. A. H. Kitalong, R. A. DeMeo, & T. Holm. Koror, Palau.

Kitalong, A. H., R. A. DeMeo, & T. Holm. 2008. Native Trees of Palau: A Field Guide. The Environment Inc., Koror, Palau.