The Plant List — A working list for all plant species

⚠ Version 1 of The Plant List has been superseded.

You should refer instead to the current version of The Plant List.

Results

No plant names match your search for Paullinia vetulina; we will try Paullinia instead.

346 plant name records match your search criteria Paullinia. The results are below.

• Genus Paullinia is in the family Sapindaceae. Species epithets begin with: A B C D E F G H I J K L M N O P Q R S T U V W X Y

The results can also be downloaded as a CSV file.

See "Status", "Confidence level", "Source" for definitions.

Name	Status	Confi­dence level	Source
Paullinia acuminata Uittien	Unresolved		WCSP (in review)
Paullinia acutangula (Ruiz & Pav.) Pers.	Accepted		TRO
Paullinia affinis Cambess.	Unresolved		WCSP (in review)
Paullinia africana G.Don	Unresolved		WCSP (in review)
Paullinia africana R.Br. ex Tedlie	Unresolved		WCSP (in review)
Paullinia alata (Ruiz & Pav.) G.Don	Accepted		WCSP (in review)
Paullinia alata var. loretana J.F. Macbr.	Synonym		TRO
Paullinia alata subsp. loretana (J.F. Macbr.) D.R. Simpson	Synonym		TRO
Paullinia alata var. pubens J.F. Macbr.	Synonym		TRO
Paullinia allenii Standl.	Accepted		TRO
Paullinia alsmithii J.F.Macbr.	Accepted		WCSP (in review)
Paullinia angusta N.E.Br.	Synonym		WCSP (in review)
Paullinia angustifolia Poir.	Unresolved		WCSP (in review)
Paullinia anisoptera Turcz.	Accepted		WCSP (in review)
Paullinia anodonta Radlk.	Unresolved		WCSP (in review)
Paullinia anomophylla Radlk.	Unresolved		WCSP (in review)
Paullinia apoda Radlk.	Unresolved		WCSP (in review)
Paullinia arborea Sessé & Moc.	Unresolved		WCSP (in review)
Paullinia arenicola Gleason	Unresolved		WCSP (in review)
Paullinia asiatica L.	Synonym		WCSP (in review)
Paullinia aspera Radlk.	Unresolved		WCSP (in review)
Paullinia aurea Radlk.	Unresolved		WCSP (in review)
Paullinia austin-smithii Standl.	Unresolved		WCSP (in review)
Paullinia australis A.St.-Hil.	Unresolved		WCSP (in review)
Paullinia baetadensis A.Gray	Unresolved		WCSP (in review)
Paullinia baileyi Standl.	Accepted		TRO
Paullinia bakeriana Huber	Unresolved		TRO
Paullinia barbadensis Jacq.	Unresolved		WCSP (in review)
Paullinia belangeroides Gardner	Unresolved		WCSP (in review)
Paullinia bernhardii Uittien	Unresolved		WCSP (in review)
Paullinia berteroana Balb. ex DC.	Unresolved		WCSP (in review)
Paullinia bicorniculata Somner	Unresolved		WCSP (in review)
Paullinia bidentata Radlk.	Accepted		TRO
Paullinia bilobulata Radlk.	Unresolved		WCSP (in review)
Paullinia bipinnata Poir.	Unresolved		WCSP (in review)
Paullinia boliviana Radlk.	Accepted		TRO
Paullinia boliviana f. glabrescens Radlk.	Synonym		TRO
Paullinia brachystachya Griseb.	Synonym		WCSP (in review)
Paullinia bracteosa Radlk.	Accepted		WCSP (in review)
Paullinia brasiliensis Lodd. ex Radlk.	Unresolved		WCSP (in review)
Paullinia brenesii Croat	Accepted		TRO
Paullinia brentberlinii Croat	Accepted		TRO
Paullinia brevispica E.Fourn. ex Radlk.	Unresolved		WCSP (in review)
Paullinia bristanii Croat	Accepted		TRO
Paullinia buricana Croat	Accepted		TRO
Paullinia californica I.M. Johnst.	Accepted		TRO
Paullinia caloptera Radlk.	Accepted		WCSP (in review)
Paullinia cambessedesii Triana & Planch.	Unresolved		WCSP (in review)
Paullinia capitata Benth. ex Triana & Planch.	Unresolved		WCSP (in review)
Paullinia capreolata (Aubl.) Radlk.	Accepted		WCSP (in review)
Paullinia caracasana Jacq.	Synonym		WCSP (in review)
Paullinia caribae Jacq.	Synonym		TRO
Paullinia carpopoda Cambess.	Unresolved		WCSP (in review)
Paullinia carrenoi Steyerm.	Accepted		WCSP (in review)
Paullinia cartagenensis Jacq.	Unresolved		WCSP (in review)
Paullinia cartagenensis Balb.	Unresolved		WCSP (in review)
Paullinia cartagenensis Dum.Cours.	Unresolved		WCSP (in review)
Paullinia cartagenensis Vis.	Unresolved		WCSP (in review)
Paullinia castanifolia Radlk.	Accepted		TRO
Paullinia caudata Vell.	Unresolved		WCSP (in review)
Paullinia cauliflora Jacq.	Accepted		WCSP (in review)
Paullinia cearensis Somner & Ferrucci	Unresolved		WCSP (in review)
Paullinia chocoensis Cuatrec.	Unresolved		WCSP (in review)
Paullinia cirrhipes Cuatrec.	Unresolved		WCSP (in review)
Paullinia clathrata Radlk.	Accepted		TRO
Paullinia clavigera Schltdl.	Accepted		TRO
Paullinia clematidifolia Killip & Cuatrec.	Unresolved		WCSP (in review)
Paullinia clernatidifolia Killip & Cuatrec.	Unresolved		WCSP (in review)
Paullinia colombiana Cuatrec.	Synonym		TRO
Paullinia concinna Sandwith	Unresolved		WCSP (in review)
Paullinia conduplicata Radlk.	Unresolved		WCSP (in review)
Paullinia connaracea Triana & Planch.	Unresolved		WCSP (in review)
Paullinia connarifolia Rich. ex Juss.	Synonym		WCSP (in review)
Paullinia coriacea Casar.	Accepted		WCSP (in review)
Paullinia correae Croat	Accepted		TRO
Paullinia costaricensis Radlk.	Accepted		TRO
Paullinia costata Schltdl. & Cham.	Accepted		TRO
Paullinia cristata Radlk.	Unresolved		WCSP (in review)
Paullinia cuneata Radlk.	Accepted		TRO
Paullinia cupana Kunth	Accepted		WCSP (in review)
Paullinia cupaniifolia Rich. ex Juss.	Synonym		WCSP (in review)
Paullinia curassavica L.	Synonym		TRO
Paullinia cururu L.	Accepted		WCSP (in review)
Paullinia curvicuspis Radlk.	Accepted		TRO
Paullinia dasygonia Radlk.	Unresolved		WCSP (in review)
Paullinia dasyphylla Radlk.	Unresolved		WCSP (in review)
Paullinia dasystachya Radlk.	Accepted		TRO
Paullinia dasystachya f. hirta Radlk.	Synonym		TRO
Paullinia densiflora Sm.	Unresolved		WCSP (in review)
Paullinia dentata Vell.	Synonym		WCSP (in review)
Paullinia discolor Gardner	Unresolved		WCSP (in review)
Paullinia dissecta Killip	Unresolved		TRO
Paullinia divaricata Sw.	Synonym		TRO
Paullinia diversiflora Miq.	Unresolved		TRO
Paullinia diversifolia Jacq.	Synonym		WCSP (in review)
Paullinia dodgei Standl.	Accepted		TRO
Paullinia dukei Croat	Accepted		TRO
Paullinia echinata Radlk.	Accepted		WCSP (in review)
Paullinia echinata Huber	Unresolved		TRO
Paullinia elegans Cambess.	Accepted		TRO
Paullinia eliasii Croat	Accepted		TRO
Paullinia elliptica Cuatrec.	Unresolved		WCSP (in review)
Paullinia elongata Radlk.	Synonym		TRO
Paullinia emetica R.E.Schult.	Unresolved		WCSP (in review)
Paullinia enneaphylla G. Don	Accepted		TRO
Paullinia eriantha Benth. ex Radlk.	Synonym		TRO
Paullinia eriocarpa Triana & Planch.	Accepted		TRO
Paullinia erythrocarpa Casar.	Unresolved		WCSP (in review)
Paullinia exalata Radlk.	Accepted		TRO
Paullinia excisa Radlk.	Synonym		TRO
Paullinia faginea (Triana & Planch.) Radlk.	Accepted		WCSP (in review)
Paullinia falcata Gardner	Unresolved		WCSP (in review)
Paullinia fasciculata Radlk.	Synonym		TRO
Paullinia ferruginea Casar.	Unresolved		WCSP (in review)
Paullinia fibrigera Radlk.	Accepted		TRO
Paullinia fibulata Rich.	Synonym		TRO
Paullinia filicifolia Cuatrec.	Unresolved		WCSP (in review)
Paullinia fimbriata Radlk.	Accepted		WCSP (in review)
Paullinia firma Radlk.	Unresolved		WCSP (in review)
Paullinia fissistipula J.F. Macbr.	Accepted		TRO
Paullinia fistulosa Radlk.	Accepted		TRO
Paullinia florenciana Cuatrec.	Synonym		TRO
Paullinia fluminensis Vell.	Unresolved		WCSP (in review)
Paullinia fournieri J.F.Morales	Unresolved		WCSP (in review)
Paullinia fraxinifolia Triana & Planch.	Unresolved		WCSP (in review)
Paullinia funicularis Radlk.	Accepted		TRO
Paullinia fusca Griseb.	Synonym		TRO
Paullinia fuscescens Kunth	Accepted		WCSP (in review)
Paullinia fuscescens var. fuscescens	Accepted		TRO
Paullinia fusiformis Radlk.	Accepted		WCSP (in review)
Paullinia gigantea Poepp.	Accepted		TRO
Paullinia glabra Bertol.	Synonym		TRO
Paullinia globosa Killip & Cuatrec.	Unresolved		WCSP (in review)
Paullinia glomerulosa Radlk.	Accepted		WCSP (in review)
Paullinia granatensis (Planch. & Linden) Radlk.	Accepted		TRO
Paullinia grandiflora Cambess.	Synonym		WCSP (in review)
Paullinia grandifolia Benth. ex Radlk.	Accepted		WCSP (in review)
Paullinia guarumima Vell.	Unresolved		WCSP (in review)
Paullinia guatemalensis Turcz.	Synonym		TRO
Paullinia guaviarensis Killip & Cuatrec.	Unresolved		WCSP (in review)
Paullinia guayaquilensis Killip	Unresolved		TRO
Paullinia haughtii Killip	Unresolved		TRO
Paullinia hemiptera D.R. Simpson	Accepted		TRO
Paullinia hispida Jacq.	Accepted		WCSP (in review)
Paullinia hitchcockii Gleason	Unresolved		WCSP (in review)
Paullinia hostmannii Steud.	Synonym		TRO
Paullinia hymenobracteata Radlk. ex Donn.Sm.	Unresolved		WCSP (in review)
Paullinia hystrix Radlk.	Accepted		TRO
Paullinia imberbis Radlk.	Accepted		WCSP (in review)
Paullinia ingaefolia Rusby	Synonym		TRO
Paullinia ingifolia Rich. ex Juss.	Accepted		WCSP (in review)
Paullinia integra Cuatrec.	Unresolved		WCSP (in review)
Paullinia interoupta Radlk.	Unresolved		TRO
Paullinia interrupta Benth.	Unresolved		WCSP (in review)
Paullinia isoneura Killip	Unresolved		TRO
Paullinia isoptera Radlk.	Unresolved		WCSP (in review)
Paullinia itayensis J.F. Macbr.	Accepted		TRO
Paullinia jamaicensis Macfad.	Unresolved		WCSP (in review)
Paullinia japonica Thunb.	Synonym		TRO
Paullinia josecuatrii J.F. Macbr.	Accepted		TRO
Paullinia kallunkii Croat	Accepted		TRO
Paullinia killipii J.F. Macbr.	Accepted		TRO
Paullinia lachnocarpa Benth. ex Radlk.	Synonym		TRO
Paullinia lactescens Poepp.	Synonym		TRO
Paullinia laeta Radlk.	Accepted		TRO
Paullinia largifolia Radlk.	Accepted		TRO
Paullinia latifolia Benth. ex Radlk.	Accepted		TRO
Paullinia leiocarpa Griseb.	Accepted		WCSP (in review)
Paullinia linearia Radlk.	Unresolved		TRO
Paullinia linearis Radlk.	Accepted		TRO
Paullinia lingulata Acev.-Rodr.	Unresolved		WCSP (in review)
Paullinia livescens Radlk.	Accepted		WCSP (in review)
Paullinia longifolia Radlk.	Unresolved		TRO
Paullinia longipes St.-Lag.	Unresolved		WCSP (in review)
Paullinia lucida Salisb.	Unresolved		WCSP (in review)
Paullinia lucida Poir.	Unresolved		WCSP (in review)
Paullinia lupulina Poir.	Unresolved		WCSP (in review)
Paullinia macrocarpa Radlk.	Unresolved		WCSP (in review)
Paullinia macrophylla Kunth	Unresolved		WCSP (in review)
Paullinia macrophylla Cambess.	Unresolved		WCSP (in review)
Paullinia macropoda St.-Lag.	Unresolved		WCSP (in review)
Paullinia macrostachya Turcz. ex Hemsl.	Unresolved		TRO
Paullinia magdalenensis Killip	Unresolved		TRO
Paullinia mallophylla Radlk.	Accepted		TRO
Paullinia manarae Steyerm.	Accepted		WCSP (in review)
Paullinia marginata Casar.	Unresolved		WCSP (in review)
Paullinia mariae J.F. Macbr.	Accepted		TRO
Paullinia maritima Vell.	Unresolved		WCSP (in review)
Paullinia martinensis Cuatrec.	Accepted		TRO
Paullinia mazanensis J.F. Macbr.	Accepted		TRO
Paullinia medullosa Radlk.	Unresolved		WCSP (in review)
Paullinia meliifolia Juss.	Accepted		WCSP (in review)
Paullinia metensis Killip & Cuatrec.	Synonym		TRO
Paullinia mexiae Steyerm.	Synonym		TRO
Paullinia mexicana L.	Synonym		WCSP (in review)
Paullinia meyeniana Walp.	Unresolved		WCSP (in review)
Paullinia micrantha Cambess.	Accepted		WCSP (in review)
Paullinia microneura Cuatrec.	Accepted		TRO
Paullinia micropterygia Miq.	Unresolved		WCSP (in review)
Paullinia microsepala Radlk.	Unresolved		WCSP (in review)
Paullinia mollicoma Steyerm.	Accepted		WCSP (in review)
Paullinia mollis Kunth	Unresolved		WCSP (in review)
Paullinia monogyna (Hoffmanns. ex Schltdl.) Radlk.	Synonym		TRO
Paullinia monogyna f. minor Radlk.	Synonym		TRO
Paullinia moquisapaensis J.F. Macbr. ex L. Williams	Accepted		TRO
Paullinia morii Croat	Accepted		TRO
Paullinia multiflora Cambess.	Unresolved		WCSP (in review)
Paullinia naiguatensis Steyerm.	Synonym		WCSP (in review)
Paullinia navicularis Radlk.	Accepted		TRO
Paullinia neglecta Radlk.	Synonym		TRO
Paullinia neuroptera Radlk.	Unresolved		WCSP (in review)
Paullinia nitida Kunth	Accepted		WCSP (in review)
Paullinia nobilis Radlk.	Accepted		TRO
Paullinia nodosa Jacq.	Unresolved		WCSP (in review)
Paullinia novemalata Uittien	Unresolved		WCSP (in review)
Paullinia nuriensis Steyerm.	Accepted		WCSP (in review)
Paullinia obliqua Ruiz & Pav. ex Radlk.	Synonym		TRO
Paullinia obovata (Ruiz & Pav.) Pers.	Accepted		TRO
Paullinia obtusa Vell.	Unresolved		WCSP (in review)
Paullinia occidentalis Sessé & Moc.	Unresolved		WCSP (in review)
Paullinia oceanica auct.	Unresolved		WCSP (in review)
Paullinia olivacea Radlk.	Accepted		TRO
Paullinia ovalis Radlk.	Synonym		TRO
Paullinia pachycarpa Benth.	Accepted		WCSP (in review)
Paullinia panamensis Croat	Accepted		TRO
Paullinia parvibractea Radlk.	Accepted		TRO
Paullinia paullinioides Radlk.	Accepted		WCSP (in review)
Paullinia pendulifolia Rusby	Synonym		TRO
Paullinia perlata Radlk.	Unresolved		WCSP (in review)
Paullinia pilonensis Croat	Accepted		TRO
Paullinia pinnata L.	Accepted		WCSP (in review)
Paullinia plagioptera Radlk.	Unresolved		WCSP (in review)
Paullinia platymisca Radlk.	Unresolved		WCSP (in review)
Paullinia plumieri Triana & Planch.	Unresolved		WCSP (in review)
Paullinia podocarpa Klotzsch	Unresolved		WCSP (in review)
Paullinia polyphylla Schumach.	Unresolved		WCSP (in review)
Paullinia polyphylla Aubl. ex Steud.	Unresolved		WCSP (in review)
Paullinia polyphylla Sm.	Unresolved		WCSP (in review)
Paullinia polyphylla L.	Unresolved		WCSP (in review)
Paullinia polystachya Turcz.	Synonym		TRO
Paullinia protracta Steud.	Synonym		TRO
Paullinia pseudota Radlk. ex Warm.	Unresolved		WCSP (in review)
Paullinia pterocarpa Triana & Planch.	Accepted		TRO
Paullinia pterophylla Triana & Planch.	Accepted		TRO
Paullinia pteropoda DC.	Unresolved		WCSP (in review)
Paullinia pubescens DC.	Unresolved		WCSP (in review)
Paullinia quassiaefolia Linden	Unresolved		TRO
Paullinia quercifolia Rusby	Synonym		TRO
Paullinia quitensis Radlk.	Synonym		TRO
Paullinia racemosa Poir.	Unresolved		WCSP (in review)
Paullinia racemosa Vell.	Unresolved		WCSP (in review)
Paullinia racemosa Wawra	Unresolved		WCSP (in review)
Paullinia reticulata Radlk.	Unresolved		WCSP (in review)
Paullinia revoluta Radlk.	Accepted		WCSP (in review)
Paullinia rhizantha Poepp. & Endl.	Synonym		TRO
Paullinia rhomboidea Radlk.	Unresolved		WCSP (in review)
Paullinia ribesiaecarpa Rusby	Synonym		TRO
Paullinia riodocensis Somner	Unresolved		WCSP (in review)
Paullinia riparia (Spruce ex Radlk.) Radlk.	Synonym		TRO
Paullinia rossii Lodd. ex Radlk.	Unresolved		WCSP (in review)
Paullinia rubicaulis Pav. ex Radlk.	Unresolved		WCSP (in review)
Paullinia rubiginosa Cambess.	Accepted		WCSP (in review)
Paullinia rubiginosa f. setosa Radlk.	Synonym		TRO
Paullinia rufescens Rich. ex Juss.	Accepted		WCSP (in review)
Paullinia rugosa Benth. ex Radlk.	Accepted		WCSP (in review)
Paullinia scaberula R.E.Schult.	Unresolved		WCSP (in review)
Paullinia scabra Benth.	Unresolved		WCSP (in review)
Paullinia scarlatina Radlk.	Synonym		TRO
Paullinia selenoptera Radlk.	Synonym		TRO
Paullinia seminuda Radlk.	Unresolved		WCSP (in review)
Paullinia senegalensis Juss.	Unresolved		WCSP (in review)
Paullinia seriana Vell.	Unresolved		WCSP (in review)
Paullinia seriana L.	Unresolved		WCSP (in review)
Paullinia seriana Gaertn.	Unresolved		WCSP (in review)
Paullinia sericea Cambess.	Unresolved		WCSP (in review)
Paullinia serjana Sessé & Moc.	Unresolved		WCSP (in review)
Paullinia serjaniifolia Triana & Planch.	Accepted		WCSP (in review)
Paullinia sessiliflora Radlk.	Accepted		TRO
Paullinia setosa Radlk.	Accepted		TRO
Paullinia simulans J.F. Macbr.	Accepted		TRO
Paullinia sinuata Lam.	Unresolved		WCSP (in review)
Paullinia sonorensis S. Watson	Synonym		TRO
Paullinia sorbilis Mart.	Synonym		TRO
Paullinia spectabilis Poir.	Unresolved		WCSP (in review)
Paullinia sphaerocarpa Rich. ex Juss.	Accepted		WCSP (in review)
Paullinia spicata Benth.	Accepted		WCSP (in review)
Paullinia spicithyrsa Cuatrec.	Unresolved		WCSP (in review)
Paullinia spinosa (Radlk.) I.M. Johnst.	Synonym		TRO
Paullinia splendida R.E.Schult.	Unresolved		WCSP (in review)
Paullinia sprucei J.F. Macbr.	Accepted		TRO
Paullinia stellata Radlk.	Accepted		WCSP (in review)
Paullinia stenopetala Sagot	Unresolved		WCSP (in review)
Paullinia sternii Croat	Accepted		TRO
Paullinia stipitata Cuatrec.	Accepted		TRO
Paullinia stipularis Benth. ex Radlk.	Accepted		TRO
Paullinia subalata A.Gray	Unresolved		WCSP (in review)
Paullinia subauriculata Radlk.	Accepted		TRO
Paullinia subcordata Benth. ex Radlk.	Synonym		TRO
Paullinia subnuda Radlk.	Accepted		TRO
Paullinia subrotunda (Ruiz & Pav.) Pers.	Synonym		TRO
Paullinia talamancensis J.F.Morales	Unresolved		WCSP (in review)
Paullinia tamuya Vell.	Unresolved		WCSP (in review)
Paullinia tarapotensis Radlk.	Accepted		TRO
Paullinia tatei Rusby	Synonym		TRO
Paullinia tenera Poepp.	Accepted		TRO
Paullinia tenuifolia Standl. ex J.F.Macbr.	Accepted		WCSP (in review)
Paullinia ternata Radlk.	Unresolved		WCSP (in review)
Paullinia tetragona Aubl.	Accepted		WCSP (in review)
Paullinia thalictrifolia Juss.	Unresolved		WCSP (in review)
Paullinia thalictrifolia DC.	Unresolved		WCSP (in review)
Paullinia timbo Vell.	Unresolved		WCSP (in review)
Paullinia tomentosa Jacq.	Accepted		TRO
Paullinia tortuosa (Benth.) Brandegee	Synonym		TRO
Paullinia toxicodendroides Steyerm.	Synonym		WCSP (in review)
Paullinia triantennata Silveira	Unresolved		WCSP (in review)
Paullinia tricornia Radlk.	Unresolved		TRO
Paullinia tricornis Radlk.	Unresolved		WCSP (in review)
Paullinia trifoliolata Obando, R.Bernal & Acev.-Rodr.	Unresolved		WCSP (in review)
Paullinia trigonia Vell.	Accepted		WCSP (in review)
Paullinia trilatera Radlk.	Accepted		TRO
Paullinia triptera Triana & Planch.	Synonym		TRO
Paullinia triquetra Dum.Cours.	Unresolved		WCSP (in review)
Paullinia triquetra Sessé & Moc.	Unresolved		WCSP (in review)
Paullinia trisulca Radlk.	Synonym		TRO
Paullinia triternata L.	Synonym		WCSP (in review)
Paullinia triternata Kunth	Misapplied		WCSP (in review)
Paullinia tumbesensis D.R. Simpson	Accepted		TRO
Paullinia turbacensis Kunth	Accepted		TRO
Paullinia uchocacha J.F. Macbr.	Accepted		TRO
Paullinia uloptera Radlk.	Unresolved		WCSP (in review)
Paullinia urvilleoides Radlk.	Synonym		TRO
Paullinia uvata Schumach. & Thonn.	Unresolved		WCSP (in review)
Paullinia vaupesana Killip & Cuatrec.	Synonym		TRO
Paullinia velutina DC.	Synonym		TRO
Paullinia venezuelana Radlk.	Accepted		WCSP (in review)
Paullinia venosa Radlk.	Accepted		TRO
Paullinia venusta Radlk.	Synonym		TRO
Paullinia verecunda Standl.	Synonym		TRO
Paullinia verrucosa Radlk.	Accepted		WCSP (in review)
Paullinia vespertilio Sw.	Unresolved		WCSP (in review)
Paullinia weinmanniifolia A.Gray	Unresolved		WCSP (in review)
Paullinia weinmanniifolia Mart.	Unresolved		WCSP (in review)
Paullinia wetmorei Standl.	Synonym		TRO
Paullinia williamsii J.F. Macbr.	Synonym		TRO
Paullinia xestophylla Radlk.	Accepted		TRO
Paullinia yoco R.E. Schult. & Killip	Accepted		TRO