Question: What was the last plant to be named extinct?

List of extinct plants

The following is a list of extinct plants only.

Prehistoric extinctions


Extinct plants by geologic period
Devonian
Archaeopteris
Carboniferous
Annularia
Sigillaria
Lepidodendron
Calamites
Sphenophyllum
Permian
Cordaites
Glossopteris
Sphenophyllum
Triassic
Araucarioxylon[1]
Caytoniales (extinct at the end of the Cretaceous)
Cladophlebis
Zamites
Brachyphyllum
Pleuromeia
Pannaulika
Sphenophyllum
Jurassic
Araucaria mirabilis[2]
Araucarites sanctaecrucis[2]
Baiera
Coniopteris
Cycadeoidea
Czekanowskia
Eboracia
Equisetum thermale (La Matilde Formation, Argentina)[3]
Gleichenites
Neocalamites
Nilssonia
Pararaucaria patagonica[2]
Pterophyilum
Schmeissneria
Cretaceous
Archaeamphora (Northeastern China)
Archaeanthus
Archaefructus
Ephedrites
Liaoningocladus
Orontium mackii (Maastrictian?, McRea Formation, North America)[4]
Palaeoaldrovanda (Czech Republic)
Pagiophyllum
Pityocladus
Podozamites
Sagaria (Southern Italy)
Sphenobaiera
Williamsonia
Williamsoniella
Paleocene
Acer alaskense (Chickaloon Formation, Alaska) [5]
Banksieaeidites (Australia) (species through the Miocene)
Cornus piggae (Almont/Biecegal Creek, North America)[6]
Pinus peregrinus (Golden Valley Formation)[7]
Ginkgo cranei (Sentinel Butte Formation)[8]
Metasequoia foxii (Paskapoo Formation, Alberta)[9]
Montrichardia aquatica (Cerrejón Formation, Colombia)[10]
Petrocardium (Cerrejón Formation, Colombia)[10]
Eocene
Acer castorrivularis (Montana, North America)[5]
Acer clarnoense (John Day Formation, North America)[5]
Acer douglasense (West Foreland Formation, Alaska, North America)[5]
Acer hillsi (Klondike Mountain Formation, Washington, North America)[5]
Acer republicense (Klondike Mountain Formation, Washington, North America)[5]
Acer rousei (Allenby Formation, McAbee Site, British Columbia, North America)[5]
Acer stewarti (Allenby Formation, British Columbia, North America)[5]
Acer stonebergae (Okanagan Highlands, North America)[5]
Acer taurocursum (Bull Run flora, North America)[5]
Acer toradense (Okanagan Highlands, North America)[5]
Acer washingtonense (Klondike Mountain Formation, Washington, North America)[5]
Actinidia oregonensis (Central Oregon, USA)[11]
Azolla primaeva (British Columbia, Canada)[12]
Abies milleri (British Columbia, Canada; Washington, USA)[13]
Banksia archaeocarpa (Australia)
Chamaecyparis eureka (Axel Heiberg Island, Canada)[14]
Corylopsis reedae (Klondike Mountain Formation, Washington, North America)[15]
Cornus clarnensis (Central Oregon, USA)[11]
Coryloides (Central Oregon, USA)[11]
Corylus johnsonii (Washington, USA)[16]
Dillhoffia (British Columbia, Canada; Washington, USA)[17]
Diploporus (Paleocene-Eocene; Sentinel Butte Formation, Clarno Formation)[11]
Eucommia eocenica (Claiborne Formation, southeastern North America)[18]
Eucommia montana (Western North America)[18]
Eucommia jeffersonensis (John Day Formation, Oregon, North America)[18]
Eucommia rolandii (North America)[18]
Fothergilla malloryi (Klondike Mountain Formation, Washington, North America)[15]
Ginkgo dissecta (Ypresian, Okanagan Highlands)[19]
Kardiasperma (Central Oregon, USA)[11]
Langeria magnifica (Okanagan highlands, north America)[20]
Latanites (Italy) [21]
Nelumbo aureavallis (North Dakota, North America)[7]
Neviusia dunthornei (Allenby Formation, North America)[22]
Orontium wolfei (Okanagan Highlands)[4]
Paleopanax (Central Oregon, USA)[11]
Peltandra primaeva (North Dakota, USA)[7]
Pinus driftwoodensis (Driftwood Canyon Provincial Park, British Columbia)[23]
Rhizomnium dentatum (Baltic amber, Europe)[24]
Rhus malloryi  (Washington, USA)[20]
Rhus rooseae (Central Oregon, USA)[11]
Sassafras hesperia (Okanogan Highlands)[20]
Saxonipollis ("East Germany")
Stonebergia (British Columbia, Canada) [25]
Taxus masonii (Central Oregon, USA)[11]
Tilia johnsoni  (Washington, USA)[20]
Torreya clarnensis (Central Oregon, USA)[11]
Trochodendron drachukii (Okanogan Highlands)[26]
Trochodendron nastae (Washington, USA)[27]
Oligocene
Acer ashwilli (John Day Formation, Oregon)[5]
Acer chaneyi (Oligocene to Miocene)[5]
Acer dettermani (Late Eocene - Early Oligocene; Meshik Volcanics, Alaska)[5]
Acer ivanofense (Late Eocene - Early Oligocene; Meshick Volcanics, Alaska)[5]
Acer kenaicum (Oligocene; Kenai Group, Alaska)[5]
Banksia novae-zelandiae (South Island, New Zealand) (Straddles the Oligocene-Miocene boundary)
Miocene
Acer browni (western North America)[5]
Acer latahense (western North America)[5]
Acer smileyi (Late Oligocene-Middle Miocene; western North America)[5]
Acer traini (western North America)[5]
Carya washingtonensis (Washington State, North America)[28] 
Droserapites (Taiwan)
Droserapollis (Taiwan)
Hymenaea allendis (Late Oligocene - early Eocene; Mexican Amber)[29]
Hymenaea mexicana (Late Oligocene - early Eocene; Mexican Amber)[29]
Hymenaea protera (Dominican amber)
Osmunda wehrii (Yakima Canyon Flora, North America)[30]
Palaeoraphe (Dominican Republic)[31]
Roystonea palaea (Dominican amber)[31]
Sequoiadendron chaneyi (Western North America)[32]
Wessiea yakimaensis (Yakima Canyon Flora, North America)[33]
Pliocene
Acer palaeorufinerve (Miocene - Pliocene; East Asia and possibly Alaska?)[5]
Pinus matthewsii[34]
Pleistocene
Banksia kingii (Western Tasmania)
Banksia strahanensis (Western Tasmania)
Picea critchfieldi (North America)
Modern extinctions
Africa

Acalypha rubrinervis (1870, Saint Helena)
Aspalathus complicata (1940s, South Africa: Cape Flora) [35]
Aspalathus cordicarpa (1950s, South Africa: Cape Flora) [35]
Aspalathus variegata (1900, South Africa: Cape Flora) [35]
Barleria natalensis (1900, South Africa) [35]
Brachystelma schoenlandianum (1900, South Africa: Cape Flora) [35]
Byttneria ivorensis (1896, Côte d'Ivoire)
Cephalophyllum parvulum (1900, South Africa: Cape Flora) [35]
Ceropegia antennifera (1910, South Africa) [35]
Ceropegia bowkeri (1900, South Africa) [35]
Coffea lemblinii (1907, Côte d'Ivoire)
Conophytum semivestitum (1900, South Africa) [35]
Crassula subulata (1900, South Africa: Cape Flora) [35]
Cyclopia filiformis (1900, South Africa: Cape Flora) [35]
Disa forcipata (1900, South Africa: Cape Flora) [35]
Dryopteris ascensionis (1889, Ascension Island)
Erica alexandri subsp. acockii (1940, South Africa: Cape Flora) [35]
Erica foliacea subsp. fulgens (1900, South Africa: Cape Flora) [35]
Erica pyramidalis var. pyramidalis (1910, South Africa: Cape Flora) [35]
Eugenia pusilla (1920, South Africa) [35]
Helichrysum outeniquense (1950, South Africa: Cape Flora) [35]
Saint Helena Heliotrope – Heliotropium pannifolium (1808, Saint Helena)
Isolepis bulbifera (1950, South Africa: Cape Flora) [35]
Lampranthus vanzijliae (1920, South Africa: Cape Flora) [35]
Leucadendron grandiflorum (1805, South Africa: Cape Flora) [35]
Leucadendron spirale (1930, South Africa: Cape Flora) [35]
Liparia graminifolia (1830, South Africa: Cape Flora) [35]
Macledium pretoriense (1925, South Africa) [35]
Macrostylis villosa subsp. minor (1980, South Africa: Cape Flora) [35]
Nemesia micrantha (1900, South Africa: Cape Flora) [35]
Saint Helena Olive – Nesiota elliptica (2003, Saint Helena)
Oldenlandia adscensionis (1889, Ascension Island)
Orchidea eupolyanthis (1910, Cameroon)
Osteospermum hirsutum (1900, South Africa: Cape Flora) [35]
Pausinystalia brachythyrsum (1898, Cameroon)
Polhillia ignota (1950s, South Africa: Cape Flora) [35]
Psoralea cataracta (1900, South Africa: Cape Flora) [35]
Psoralea gueinzii (1930, South Africa: Cape Flora) [35]
Silphium – Ferula ? (c. 50, Cyrene)
Sporobolus durus (1886, Ascension Island)
Thamnea depressa (1900, South Africa: Cape Flora) [35]
Trochetiopsis melanoxylon (1771, Saint Helena)
Vernonella africana (1900, South Africa) [35]
Willdenowia affinis (1920, South Africa: Cape Flora) [35]
Xysmalobium baurii (1900, South Africa) [35]
Americas
Roan Mountain False Goat's-beard – Astilbe crenatiloba (1885, Roan Mountain, Tennessee)
Galapagos Amaranth – Blutaparon rigidum (1999, Galápagos Ecuador)
Rio de Janeiro Myrtle – Campomanesia lundiana (1825, Brazil)
Casearia quinduensis (1997, Colombia)
Rio de Janeiro Sapota – Chrysophyllum januariense (1997, Brazil)
Havana Fragrant Tree – Cnidoscolus fragrans (1840, Cuba)
Santa Cruz Bryophyte – Flabellidium spinosum (1911, Bolivia)
Cuban Ruta Tree – Galipea ossana (1825, Cuba)
Cuban Guettarda Tree – Guettarda retusa (1975, Cuba)
Licania caldasiana (1997, Colombia)
Mason River Myrtle – Myrcia skeldingii (1972, Jamaica)
Appalachian Yellow Asphodel – Narthecium montanum (Henderson County, North Carolina)[36]
Hastings County Neomacounia – Neomacounia nitida (1864, Canada)
Bigleaf Scurfpea – Orbexilum macrophyllum (1899, Polk County, North Carolina)
Falls-of-the-Ohio scurfpea – Orbexilum stipulatum (1881, Jefferson County, Kentucky)
Rio de Janeiro Pouteria – Pouteria stenophylla (1997, Brazil)
Cajamarca Pradosia – Pradosia argentea (1820, Peru)
Rio de Janeiro Pradosia – Pradosia glaziovii (1997, Brazil)
Colombian Pradosia – Pradosia mutisii (1925, Colombia)
Jamaican Psidium – Psidium dumetorum (1976, Jamaica)
Juan Fernandez Santalum – Santalum fernandezianum (1908, Chile)
Thismia americana – Thismia americana (1916, Chicago, IL, USA)
Asia
Adiantum lianxianense (Guangdong, China)
Sri Lanka Legume Tree – Crudia zeylanica (1990, Sri Lanka)
Kerala Legume Tree – Cynometra beddomei (1870, India)
Sumatra Dipterocarpus – Dipterocarpus cinereus (1996, Sumatra, Indonesia)
Arunchal Hopea Tree – Hopea shingkeng (1996, India)
Nilgiri Holly – Ilex gardneriana (1859, India)
Karnataka Sapota – Madhuca insignis (1900, India)
Hainan Ormosia – Ormosia howii (1997, Southern China)
Hainan Otophora – Otophora unilocularis (1935, Hainan, China)
Pluchea glutinosa (19th Century, Yemen)
Psiadia schweinfurthii (19th Century, Yemen)
Sarawak Shorea – Shorea cuspidata (1996, Malaysia)
Meghalaya Sterculia – Sterculia khasiana (1877, India)
Valerianella affinis (19th century, Yemen)
Courtallum Wendlandia – Wendlandia angustifolia (1997, India)
Woolly-stalked Begonia – Begonia eiromischa (20th century, Penang, Malaysia)
Ruzhildalani "Ruzhil" (1995, India)
Europe
Italian Bryophyte – Radula visiniaca (1938, Italy)
Cry Pansy – Viola cryana (1933, France)
Oceania

Hawaii Chaff Flower – Achyranthes atollensis (1964, Hawaiian Is.)
Argyroxiphium virescens (1996, Hawaiian Is.)
Balanops microstachya (New Caledonia)
Casearia tinifolia (1976, Mauritius)
Clermontia multiflora (1871, Hawaiian Is.)
New Calodonia Sapinda – Cupaniopsis crassivalvis (1869, New Caledonia)
Haleakala Cyanea Tree – Cyanea arborea (1928, Hawaiian Is.)
Cyanea comata (late 19th century, Hawaiian Is.)
Cyanea cylindrocalyx (1909, Hawaiian Is.)
Cyanea dolichopoda (1990, Hawaiian Is.)
Giffard's Cyanea Tree – Cyanea giffardii (1917, Hawaiian Is.)
Mark's Cyanea Tree – Cyanea marksii (1900, Hawaiian Is.) - update in 2016: This plant is endemic to Hawaiʻi, where it has experienced severe and ongoing decline in habitat and numbers due to the impacts of invasive plants and animals. Previously it was believed to be Extinct, but the rediscovery of 12 plants (occurring in two separate subpopulations) resulted in it being downlisted to CR.[37]
Pohaku Cyanea Tree – Cyanea pohaku (1910, Hawaiian Is.)
Kohala Cyanea Tree – Cyanea pycnocarpa (1997, Hawaiian Is.)
Oak-leaved Cyanea Tree – Cyanea quercifolia  (1997, Hawaiian Is.)
Dracaena umbraculifera (Mauritius)
Taravai Aster Tree – Fitchia mangarevensis (1997, Taravai, French Polynesia)
Moorea Laurel – Hernandia drakeana (1997, French Polynesia)
Kawaihae Hibiscadelphus – Hibiscadelphus bombycinus (1868, Hawaiian Is.)
Puhielelu Hibiscadelphus – Hibiscadelphus crucibracteatus (1981, Hawaiian Is.)
Auwahi Hibiscadelphus – Hibiscadelphus wilderianus  (1910, Hawaiian Is.)
Oahu Kokia – Kokia lanceolata (1888, Hawaiian Is.)
Cross-bearing Pelea – Melicope cruciata (1997, Hawaiian Is.)
Maui Ruta Tree – Melicope haleakalae (1919, Hawaiian Is.)
Obovate Melicope – Melicope obovata (1997, Hawaiian Is.)
Nuku Hiva Neisosperma – Neisosperma brownii (1997, French Polynesia)
Fatu Hiva Ochrosia – Ochrosia fatuhivensis (1997, French Polynesia)
Nuku Hiva Ochrosia – Ochrosia nukuhivensis (1997, French Polynesia)
Tahiti Ochrosia – Ochrosia tahitensis (1997, French Polynesia)
Psychotria veillonii (New Caledonia)
Koé Stenocarpus – Stenocarpus dumbeensis (1905, New Caledonia)
Norfolk Island Streblorrhiza – Streblorrhiza speciosa (1997, Norfolk Island)
Fijian Weinmannia – Weinmannia spiraeoides (1840, Fiji)
Skottsberg's Wikstroemia – Wikstroemia skottsbergiana (1997, Hawaiian Is.)
Hakeakala Wikstroemia – Wikstoemia villosa (1997, Hawaiian Is.)
Prony Bay Xanthostemon – Xanthostemon sebertii  (1869, New Caledonia)
Plants extinct in the wild

Africa
St. Helena Roundleaf Gumwood – (Commidendrum rotundifolium) (Saint Helena)
Encephalartos brevifoliolatus (South Africa) [35]
Encephalartos nubimontanus (South Africa) [35]
Encephalartos relictus (Swaziland)
Encephalartos woodii (South Africa)[35]
Erica bolusiae Salter var. cyathiformis (South Africa: Cape Flora)[35]
Erica turgida (South Africa: Cape Flora) [35]
Erica verticillata (South Africa: Cape Flora) [35]
Pleiospilos simulans (South Africa) [35]
Lotus berthelotii (Canary Islands)
St. Helena Redwood – (Trochetiopsis erythroxylon) (Saint Helena)
Americas
Cosmos atrosanguineus (Mexico)
Csapodya splendens (syn. Deppea splendens)  (Mexico)
Root-spine Palm – (Cryosophila williamsii) (Honduras)
Cuban Erythroxylum – (Erythroxylum echinodendron) (Cuba)
Franklin Tree – (Franklinia alatamaha) (Georgia, U.S.)
Laelia gouldiana (Mexico)
Biznaguita – (Mammillaria glochidiata) (Mexico)
Biznaguita – (Mammillaria guillauminiana) (Mexico)
Rio de Janeiro Terminalia – (Terminalia acuminata) (Brazil)
Bastard gumwood (Commidendrum rotundifolium) (St. Helena)
Asia
India Monocarpic Palm – (Corypha taliera) - (Bengal)
Pallasana Spurge – (Euphorbia mayurnathanii) (India)
Yunnan Malva – (Firmiana major) (Yunnan, China)
Kalimantan Mango – (Mangifera casturi) (Kalimantan, Indonesia)
Sarawak Mango – (Mangifera rubropetala) (Kalimantan & Sumatra)
Kanehira Azalea – (Rhododendron kanehirai) (Taiwan)
Tulipa sprengeri)
Europe
Oceania
Cyanea pinnatifida (Hawaiian Is.)
Royal Cyanea Tree – (Cyanea superba) (Hawaiian Is.)
Punaluu Cyanea – (Cyanea truncata) (Hawaiian Is.)
Fuzzyflower Cyrtandra – (Cyrtandra waiolani) (Hawaiian Is.)
Hemiandra rutilans (Australia)
Cooke's Kokia – (Kokia cookei) (Hawaiian Is)
Toromiro – (Sophora toromiro) (Easter Island, Chile)
Extinct plant cultivars

Ansault – pear cultivar
Semper augustus – tulip traded during tulip mania
Taliaferro – apple cultivar
Viceroy – tulip traded during tulip mania
Plants previously thought extinct and subsequently rediscovered
See Lazarus species
Badula ovalifolia – from Mauritius. Known in 1830's; collected in 1970 and 1997 but misidentified (Page and D'Argent 1997, IUCN report)/confirmed identity in 2008 (Florens et al., Kew Bulletin)
Café marron (Ramosmania rodriguesii) – rediscovered on Rodrigues in 1979
Jellyfish tree (Medusagyne oppositifolia) – rediscovered in Seychelles in the 1970s
Sichuan Thuja (Thuja sutchuenensis) – rediscovered 1999 (Sichuan, China)
Gibraltar Campion (Silene tomentosa) – rediscovered on Gibraltar in 1994
Astragalus nitidiflorus (1909, Spain) – rediscovered 2004 (Cartagena, Spain)
Extinct algae
Bennett's Seaweed (Vanvoorstia bennettiana) – a red alga. (1886, Australia)
See also
List of recently extinct plants
List of extinct animals
A list of Presumed Extinct Plant species in South Africa (likely to be extinct but not yet adequately confirmed) can be found at