Poales
Family: Bromeliaceae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Aechmea cymosopaniculata | Baker | 1856 | Aragua State, Venezuela | Missing | Access | |
| Aechmea geminiflora | (Harms) L.B.Sm. & M.A.Spencer | 1933 | Tungurahua Province, Ecuador | Missing | Access | |
|
Aechmea serrata
|
(Linnaeus) Mez | ? | Martinique | Extinct or extinct in the wild | Access | |
| Billbergia buchholtzii | Mez | ? | Brazil | Extinct in the wild? | Access | |
| Canistropsis elata | (E. Pereira & Leme) Leme | ? | Rio de Janeiro, Brazil | Extinct in the wild | Access | |
| Cryptanthus bivittatus | (Hook.) Regel | (rediscovered) | Pernambuco, Brazil | Rediscovered | Access | |
| Cryptanthus diversifolius | Beer | ? | Rio de Janeiro, Brazil | Invalid (synonym) | Access | |
| Cryptanthus fosterianus | L.B.Sm. | ? | Brazil | Invalid (synonym) | Access | |
| Cryptanthus lacerdae | Van Geert | ? | Bahia, Brazil | Extinct in the wild? | Access | |
| Dyckia marnier-lapostollei marnier-lapostollei | L.B.Sm. | (rediscovered) | Brazil | Rediscovered | Access | |
|
Dyckia remotiflora tandilensis |
(Speg.) Cabrera (1968) | - | 1901 | Sierra de Tandil, Buenos Aires, Argentina | Extinct | Access |
|
Guzmania lepidota
|
(Andrè) Andrè ex Mez | June 1876 | Ecuador | Missing | Access | |
| Guzmania poortmanii | (Andrè) Andrè ex Mez | 1889 | Ecuador | Missing | Access | |
| Guzmania striata | L.B.Sm. | 1956 | Ecuador | Missing | Access | |
| Hechtia texensis | S.Watson | (rediscovered) | Mexico & Texas, USA | Rediscovered | Access | |
| Hohenbergia correia-araujoi | Pereira & Moutinho | (rediscovered) | Bahia, Brazil | Rediscovered in the wild | Access | |
| Neoregelia binotii | (É.Morren) L.B.Sm. | ? | Brazil | Missing | Access | |
| Neoregelia pineliana | (Lem.) L.B.Sm. | ? | Brazil | Extinct | Access | |
|
Nidularium utriculosum |
Ule | <60 years ago | Rio de Janeiro, Brazil | Missing | Access | |
|
Pitcairnia aphelandriflora |
Lem. (1869) | - | 1869 or later | Ste. Catherine, off coast of Santa Catarina, Brazil | Missing | Access |
| Pitcairnia elliptica | Mez & Sodiro | - | Ecuador | Rediscovered | Access | |
| Pitcairnia glymiana | K.Koch | ? | Caribbean? | Extinct | Access | |
| Pitcairnia undulata | Scheidw. | (rediscovered) | Mexico | Rediscovered | Access | |
| Vriesea maculosa | Mez, 1913 | - | Bahia, Brazil | Rediscovered | Access | |
| Vriesea rectifolia | Rauh. | - | Mata Atlantica, Brazil | Missing | Access | |
| Waltillia hatschbachii | (L.B.Sm. & Read) Leme, Barfuss & Halbritt | - | Brazil | Rediscovered | Access |
Family: Cyperaceae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
|
Bulbostylis bodardii |
S.S.Hooper | - | 1948 | Guinea (& Senegal?) | Missing | Access |
| Bulbostylis neglecta | (Hemsl.) C.B.Clarke | Neglected tuft sedge | - | St. Helena | Rediscovered | Access |
| Bulbostylis warei | (Torr.) C.B.Clarke | (rediscovered) | Alabama, Florida, Georgia, North Carolina & South Carolina | Rediscovered | Access | |
|
Carex aboriginum
|
M.E.Jones | - | Adams County (near Goodrich & the Indian Valley area), Idaho (western), USA | Rediscovered | Access | |
|
Carex × christii |
Boeckeler (1890) | - | ? | Tamil Nadu, India | Uncertain | Access |
|
Carex fuscifructus |
C.B.Clarke (1894) | - | 1877 | Assam, India | Invalid (synonym) | Access |
| Carex kucyniakii | Raymond, 1955 | - | Vietnam | Rediscovered | Access | |
| Carex lapazensis | C.B.Clarke | 1864 | near La Paz, Bolivia | Missing | Access | |
| Carex paupera | Nelmes | ? | Victoria, Australia | Invalid (synonym) | Access | |
| Carex repanda | C.B.Clarke | (rediscovered) | India | Rediscovered | Access | |
|
Carex vicinalis |
Boott (1867) | - | 1867 or before | Nilgiri Hills, Tamil Nadu, India | Missing | Access |
| Carex wahuensis herbstii | T.Koyama | 1995 | Oahu, Hawaiian Islands, USA | Missing | Access | |
| Cladium drummondii | C.B.Clarke | ? | Australia | Invalid (synonym) | Access | |
| Costularia xipholepis | Baker, 1877 | - | Mahé Island, Seychelles | Rediscovered | Access | |
|
Cyperus chionocephalus
|
(Chiov.) Chiov. ex Chiarugi | 1939 | Ethiopia | Missing | Access | |
| Cyperus kyllingiformis | Lye | ? | Kenya | Missing | Access | |
| Cyperus multifolius | Kunth. | early 1800's | Ecuador | Missing | Access | |
| Cyperus neokunthianus | Kükenth. | 1980 | Maui, Hawaiian Islands, USA | Missing | Access | |
| Cyperus pennatiformis | Kük. | (rediscovered) | Hawaiian Islands, USA | Rediscovered | Access | |
| Cyperus pilosus polyantha | C.B. Clarke, 1884 | 1886 | Bangladesh | Missing | Access | |
| Cyperus rockii | Kük. | 1900 | Kauai, Hawaiian Islands, USA | Missing | Access | |
| Cyperus scott-elliotii | Govaerts | ? | Kenya | Missing | Access | |
| Eleocharis bermudiana | Britton | Bermuda spike rush | - | Bermuda | Rediscovered | Access |
| Eleocharis brachycarpa | Svenson | Shortfruit spikerush | ? | Mexico & Texas, USA | Extinct | Access |
| Eleocharis lepta | C.B.Clarke | 1897 | Cape Peninsula, Cape Province, South Africa | Missing | Access | |
|
Ficinia minuta |
(Turrill) Muasya (2021) | - | 1908 | South Africa | Extinct | Access |
| Fimbristylis compacta | Turrill | (rediscovered) | Australia | Rediscovered | Access | |
| Fimbristylis leptoclada takamineana | (Ohwi) T.Koyama | ? | Nansei-shoto, Japan | Extinct | Access | |
| Fimbristylis sachetiana | Fosberg | ? | Nuku Hiva, Marquesas Islands | Missing | Access | |
| Fuirena repens | Boeckeler | - | Mexico | Rediscovered | Access | |
| Isolepis bulbifera | (Boeck.) Muasya | pre-1950 | Cape Flats, Western Cape Province, South Africa | Missing | Access | |
| Isolepis pusilla | Kunth. | - | Cape Flats to Bokkeveld Escarpment, Western Cape Province, South Africa | Rediscovered | Access | |
| Kyllinga chrysanthoides | Mtot. | 1977 | Burundi | Missing | Access | |
| Kyllinga melanosperma hexalata | Lye | 1969 | Uganda | Missing | Access | |
| Lipocarpha mangarevica | H.St.John | ? | Mangareva, Tuamotu Archipelago | Invalid (synonym) | Access | |
|
Mariscus kunthianus
|
Gaudich. | ? | Hawaiian Islands, USA | ? | Access | |
| Rhynchospora hildebrandtii | Boeckeler | 1880 | Madagascar | Missing | Access | |
| Rhynchospora joveroensis | Britton (1917) | ? | Cuba | Extinct | Access | |
|
Rhynchospora solitaria
|
Harper (1901) | (rediscovered) | Georgia, USA | Rediscovered | Access | |
| Schoenoplectiella perrieri | (Cherm.) Lye | 1933 | Madagascar | Missing | Access | |
| Schoenus acuminatus | R.Br. | (rediscovered) | Western Australia, Australia | Rediscovered | Access | |
| Schoenus natans | (F.Muell.) Benth. | - | Western Australia, Australia | Rediscovered | Access | |
| Scleria anomala | (Steud.) J.Raynal | ? | Mauritius | Extinct | Access | |
| Scleria chevalieri | J.Raynal | 1929 | Senegal | Extinct | Access | |
| Scleria mutoensis | Nakai | ? | Korean Peninsula | Extinct | Access | |
|
Scleria pilosa |
Boeckeler (1874) | - | ? | Sri Lanka | Missing or Extinct | Access |
| Tetraria australiensis | C.B. Clarke | - | Western Australia, Australia | Rediscovered | Access | |
| Tetraria paludosa | Levyns | 1945 | Cape Peninsula/Camps Bay, Western Cape Province, South Africa | Missing | Access | |
| Trichophorum scabriculme | (Beetle) J.R.Starr, Lév.-Bourret & B.A. Ford | - | Lào Cai Province, Vietnam | Rediscovered | Access |
Family: Ecdeiocoleaceae
–No subordinate taxa
Family: Eriocaulaceae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Comanthera circinnata | (Bong.) L.R.Parra & Giul. | (rediscovered) | Minas Gerais, Brazil | Rediscovered | Access | |
| Eriocaulon adamesii | Meikle | 1967 | Liberia & Sierra Leone | Missing | Access | |
| Eriocaulon barba-caprae | Fyson | ? | India | Extinct | Access | |
| Eriocaulon barbeyanum | Ruhland | (rediscovered) | India | Invalid (synonym) | Access | |
| Eriocaulon caesium | Griseb. | 1867 | Trinidad & Tobago | Missing | Access | |
|
Eriocaulon cauliferum
|
Makino | ? | Tatara-numa, Gunma Prefecture, Kantō region, Honshu, Japan | Missing | Access | |
| Eriocaulon echinospermoideum | Ruhland | ? | Cuba | Missing | Access | |
| Eriocaulon fergusonii | (Moldenke) S.M.Phillips | ? | Colombo and Galle districts, Sri Lanka | Missing | Access | |
| Eriocaulon heleocharioides | Satake, 1939 | 1994 or later | Japan | Extinct in the wild | Access | |
| Eriocaulon hildebrandtii | Körn. ex Ruhland | 1880 | Madagascar | Missing | Access | |
| Eriocaulon inundatum | Moldenke | 1943 | Senegal | Extinct | Access | |
|
Eriocaulon irregulare |
Meikle | - | 1962 | Guinea | Missing | Access |
| Eriocaulon johnstonii | Ruhland | ? | Mauritius, Mascarene Islands | Missing | Access | |
| Eriocaulon jordanii | (Moldenke) Meikle | 1950's | Sierra Leone | Extinct | Access | |
| Eriocaulon minutissimum | Ruhland | ? | Cuba | Extinct | Access | |
| Eriocaulon obtriangulare | Kimp. | 1967 | Côte d'Ivoire | Missing | Access | |
| Eriocaulon parvicapitulatum | Moldenke | 1914 | Madagascar | Missing | Access | |
|
Eriocaulon petraeum |
S.M.Phillips & Burgt (2012) | - | 2014 | Sula Mountains, Sierra Leone | Extinct | Access |
| Eriocaulon rouxianum | Steud. | ? | India | Extinct | Access | |
| Eriocaulon seticuspe | Ohwi | 5 October 1952 or later | a wetland in Kawanami-town, Miyazaki Prefecture, Kyushu, Japan | Invalid (synonym) | Access | |
|
Eriocaulon subglaucum |
Ruhland (1903) | - | (rediscovered) | Sri Lanka | Rediscovered | Access |
|
Eriocaulon sulanum |
S.M.Phillips & Burgt (2012) | - | 2014 | Sierra Leone (& Guinea?) | Extinct | Access |
|
Giuliettia minima |
(Silveira) Andrino, L. H. Rocha & Gonella (2024) | - | (rediscovered) | Brazil | Rediscovered | Access |
| Lachnocaulon cubense | Ruhland | ? | Cuba | Missing | Access | |
| Mesanthemum cupricola | Kimp. | 1959 | DR Congo | Missing | Access | |
| Mesanthemum tuberosum | Lecomte, 1909 | - | Guinea, Africa | Rediscovered | Access | |
|
Paepalanthus argillicola
|
Silveira | May 1910 | Brazil | Missing | Access | |
| Paepalanthus batatalensis | Silveira | April 1905 | Brazil | Missing | Access | |
|
Paepalanthus cipoensis |
Silveira | (rediscovered) | Minas Gerais, Brazil | Rediscovered | Access | |
| Paepalanthus coutoensis | Moldenke | (rediscovered) | Minas Gerais, Brazil | Rediscovered | Access | |
| Paepalanthus decussus | Körn. | (rediscovered) | Minas Gerais, Brazil | Rediscovered | Access | |
| Paepalanthus elatus | (Bong.) Körn. | (rediscovered) | Minas Gerais, Brazil | Rediscovered | Access | |
| Paepalanthus gomesii | Silveira | ? | Brazil | Missing | Access | |
| Paepalanthus ithyphyllus | (Mart.) Walp. | (rediscovered) | Minas Gerais, Brazil | Rediscovered | Access | |
| Paepalanthus moedensis | Silveira | May 1910 | Brazil | Missing | Access | |
| Paepalanthus pachyphyllus | Körn. (1863) | (rediscovered) | Minas Gerais, Brazil | Rediscovered | Access | |
| Paepalanthus pallidus | Silveira | December 1906 | Brazil | Missing | Access | |
| Paepalanthus stuetzelii | Hensold | (rediscovered) | Minas Gerais, Brazil | Rediscovered | Access |
Family: Flagellariaceae
–No subordinate taxa
Family: Joinvilleaceae
–No subordinate taxa
Family: Juncaceae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Juncus griscomii | Fernald | ? | ? | Invalid (synonym) | Access | |
| Juncus leiospermus | F.J.Herm. | (rediscovered) | California, USA | Rediscovered | Access | |
| Juncus pervetus | Fernald | Blunt-flower rush | ? | Massachusetts, USA | Extinct | Access |
Family: Mayacaceae
–No subordinate taxa
Family: Poaceae (Grasses)
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Amphibromus whitei | Hubb, 1941 | Swamp wallaby grass | 25 October 1933? | Roma, Maranoa District, Queensland, Australia | Missing | Access |
|
Anadelphia funerea |
(Jacq.-Fél.) Clayton | - | 1937 | Guinea | Missing | Access |
| Andropogon benthamianus | Steud. | 1841-1843 | Ecuador | Missing | Access | |
|
Andropogon incomptus |
Clayton | - | 1956 | Guinea | Missing | Access |
| Anomochloa marantoidea | Brongn. | (rediscovered) | Bahia, Brazil | Rediscovered | Access | |
| Arundinella kerrii | Teerawat. & Sungkaew | 1 May 1932 | Thailand | Missing | Access | |
| Arundinella thwaitesii | Hook.f. (1896) | - | ? | Sri Lanka | Missing or Extinct | Access |
| Avena breviaristata | Barratte ex Trab. | ? | Hauts Plateaux, Algeria | Missing | Access | |
|
Bothriochloa woodrovii |
(Hook.f.) A.Camus (1931) | - | 1891 or 1894 or 1960 | Maharashtra, India | Missing | Access |
| Brachiaria fragrans | A. Camus | 1960 | Madagascar | Missing | Access | |
|
Brachiaria fruticulosa |
A.Camus (1957) | - | 1955 | Ankazovandamena mountain SE of Fort Dauphin, Madagascar | Missing | Access |
| Bromus andringitrensis | A. Camus | 1922 | Madagascar | Missing | Access | |
| Bromus brachystachys | Hornung | (rediscovered) | Western Asia | Rediscovered | Access | |
| Bromus bromoideus | (Lej.) Crép. (1867) | The Brome of the Ardennes, Ardennes brome, Brome des Ardennes | 1930 | Belgium, France & Luxembourg | Extinct or Extinct in the wild | Access |
| Bromus interruptus | (Hack.) Druce (1895) | Interrupted brome | - | England | Reintroduced into the wild | Access |
| Bromus javorkae | Pénzes | ? | Egypt | Extinct | Access | |
|
Bromus mango |
É.Desv. (1854) | - | ? | Argentina & Chile | Extinct | Access |
| Bromus verticillatus | Cav. (1801) | ? | UK | Invalid (synonym) | Access | |
| Calamagrostis nubila | Louis-Marie | ? | North America | Invalid (synonym) | Access | |
| Cenchrus agrimonioides laysanensis | F.Br. | 1964 | Kure, Laysan & Midway, Hawaiian Islands, USA | Missing | Access | |
| Chasechloa egregia | (Mez) A. Camus., 1948 | 1840's-1850's | Madagascar | Missing | Access | |
| Chloris texensis |
Nash. | Texas windmill grass | (rediscovered) | Texas, USA | Rediscovered | Access |
|
Ctenium sesquiflorum |
Clayton | - | 1945 | Guinea | Missing | Access |
|
Deyeuxia abscondita
|
T.Macfarlane, 2020 | Preston bentgrass, Hidden deyeuxia | 8 December 1877 | Preston River, Western Australia, Australia | Missing | Access |
|
Deyeuxia appressa
|
Vickery, 1940 | 1941 | New South Wales, Australia | Missing | Access | |
| Deyeuxia drummondii | (Steud.) Vickery, 1940 | Drummond's grass | (rediscovered) | Western Australia, Australia | Rediscovered | Access |
| Deyeuxia lawrencei | Vickery | Lawrence's bentgrass | c.1831 | Tasmania (Launceston area?), Australia | Extinct | Access |
| Deyeuxia simlensis | Bor (1941) | ? | India | Extinct or Invalid (synonym) | Access | |
|
Dichanthelium shastense |
(Scribn. & Merr.) Wipff (2022) | - | 1908 | Castle Crags, Shasta County, California, USA | Missing | Access |
|
Digitaria bosseri |
Voronts. (2017) | - | 1963 | south-western Madagascar | Missing | Access |
| Digitaria filiformis laeviglumis | (Fernald) Wipff | Slender crabgrass | ? | New Hampshire, USA | Extinct | Access |
| Dimeria kerrii | Teerawat. & Sungkaew | 3 January 1928 | Thailand | Missing | Access | |
| Dissanthelium californicum | (Nutt.) Benth., 1881 | Catalina grass | - | Catalina Island, Channel Islands, California, USA | Rediscovered | Access |
| Elymus multiflorus kingianus | (Endl.) de Lange & R.O.Gardner | Phillip Island wheat grass | ? | Phillip Island, Australia | Rediscovered | Access |
| Elymus nepalensis | (Melderis) Melderis | (rediscovered) | India & Nepal | Rediscovered | Access | |
| Elymus russellii | (Melderis) Cope | ? | Pakistan | Missing | Access | |
| Eragrostis deflexa | Hitchc. | Pacific lovegrass | ? | Hawaiian Islands, USA | ? | Access |
|
Eragrostis fosbergii
|
Whitney | 1996 | Oahu, Hawaiian Islands, USA | Missing | Access | |
| Eragrostis hosakai | O. Deg. | ? | Molokai, Hawaiian Islands, USA | Invalid (synonym) | Access | |
| Eragrostis mauiensis | Hitchc. | pre-1872 | Lanai & Maui, Hawaiian Islands, USA | Missing | Access | |
|
Eragrostis propinqua |
Steud. (1854) | - | pre-1900 | Mauritius, Mascarene Islands | Extinct | Access |
| Eragrostis rottleri | Stapf | (rediscovered) | India | Rediscovered | Access | |
| Eriochloa michauxii simpsonii | (Hitchc.) Hitchc. | Simpson’s cupgrass | ? | Florida, USA | Extinct | Access |
| Eriochrysis rangacharii | C.E.C.Fisch. | (rediscovered) | India | Rediscovered | Access | |
| Festuca archeri | E.B.Alexeev, 1987 | Archer's fescue | ? | Tasmania, Australia | Missing | Access |
| Festuca benthamiana | Vickery | (rediscovered) | South Australia & Victoria, Australia | Rediscovered | Access | |
|
Festuca dasyclada |
Beal (1896) | Sedge fescue | (rediscovered) | Connecticut & Utah, USA | Rediscovered | Access |
|
Festuca decolorata |
Markgr.-Dann. (1981) | (rediscovered) | Mount Uludağ, Turkey | Rediscovered | Access | |
|
Festuca masatierrae |
Röser & Tkach | ? | Juan Fernández Islands | Extinct | Access | |
| Festuca molokaiensis | Soreng, P.m. Peterson & Catalán | 2009 | Molokai, Hawaiian Islands, USA | Missing | Access | |
|
Garnotia fuscata |
Thwaites (1864) | - | ? | Sri Lanka | Missing or Extinct | Access |
| Garnotia panicoides | Trimen (1889) | - | ? | Sri Lanka | Missing or Extinct | Access |
| Glyceria drummondii | (Steud.) C.E.Hubb., 1934 | Nangetty grass | 2000-2004 | north of Mingenew, Western Australia, Australia | Missing | Access |
| Glyphochloa divergens divergens | (Hack.) Clayton (1981) | (rediscovered) | India | Rediscovered | Access | |
| Gymnopogon floridanus | Swallen | ? | Florida or Georgia (or both), USA | Invalid (synonym) | Access | |
| Helictochloa hackelii | (Henriq.) Romero Zarco (2011) | (rediscovered) | Portugal | Rediscovered | Access | |
| Heterachne baileyi | C.E.Hubb. | (rediscovered) | Queensland, Australia | Rediscovered | Access | |
| Heteropholis benoistii | A. Camus | 1953 | Madagascar | Missing | Access | |
|
Hickelia alaotrensis |
A.Camus (1955) | - | 1955 or before | Anony forest, north of Lake Alaotra, Madagascar | Missing | Access |
|
Holcus notarisii |
Nyman (1855) | Bambagione di De Notaris | very late 1800's | Liguria, Italy | Extinct if valid | Access |
| Homopholis belsonii | C.E.Hubb. | (rediscovered) | New South Wales & Queensland, Australia | Rediscovered | Access | |
| Hubbardia heptaneuron | Bor, 1951 | - | India | Rediscovered | Access | |
| Isachne dimyloides | Bor, 1949 | - | West Bengal (Darjeeling district) & Assam (Cachar district), India | Rediscovered | Access | |
|
Isachne guineensis |
Stapf & C.E.Hubb. | - | 1956 | Guinea | Missing | Access |
| Isachne multiflora | (Thwaites) Ferguson (1880) | - | ? | Sri Lanka | Missing or Extinct | Access |
|
Lachnagrostis adamsonii adamsonii
|
(Vickery) S.W.L.Jacobs | Adamson’s blowngrass | - | Victoria, Australia | Rediscovered | Access |
| Lachnagrostis drummondiana | Trin. | ? | Western Australia, Australia | Missing | Access | |
| Lachnagrostis limitanea | (J.M.Black) S.W.L.Jacobs, 2001 | Spalding blown grass | - | Northern Lofty Ranges, South Australia, Australia | Rediscovered | Access |
| Leptagrostis schimperiana | (Hochst.) C.E.Hubb. | 1853 | Ethiopia | Extinct | Access | |
| Lithachne pinetii | (C.Wright ex Griseb.) Chase (1908) | ? | Cuba | Extinct | Access | |
| Loudetiopsis baldwinii | (C.E.Hubb.) J.B.Phipps | 1947 | Guinea | Missing | Access | |
| Oplismenus thwaitesii | Hook.f. (1900) | - | ? | Sri Lanka | Missing or Extinct | Access |
|
Panicum capuronii |
A.Camus (1957) | - | 1955 | Iera forest, 30 km W d'Ankazoabo, Madagascar | Missing | Access |
| Panicum crystallinum | Judz. & Voronts. | 1963 | Madagascar | Missing | Access | |
| Panicum inconspicuum | Voronts. | 1964 | Madagascar | Missing | Access | |
| Panicum norfolkianum | Nees ex Endl. | ? | Norfolk Island, Australia | Invalid (synonym) | Access | |
|
Panicum palackyanum |
A.Camus (1931 "1930") | - | 1921 | Andringitra massif, Madagascar | Missing | Access |
| Panicum pearsonii | F.Bolus | 1913 | Great Karasberg, Namibia | Missing | Access | |
| Parahyparrhenia bellariensis | (Hack.) Clayton | (rediscovered) | Andhra Pradesh, India | Rediscovered | Access | |
| Paspalidium tuyamae | Ohwi | - | Bonin Islands, Japan | Rediscovered | Access | |
|
Paspalum amphicarpum
|
Ekman | ? | Cuba | Missing | Access | |
| Paspalum batianoffii | B.K.Simon, 1992 | ? | Port Curtis district, Statue Bay, 6.5 km south-east of Yeppoon, Central Queensland | Missing | Access | |
| Paspalum jimenezii | Chase | (rediscovered) | Costa Rica, Panama & Venezuela | Rediscovered | Access | |
|
Pentameris humbertii |
(A.Camus) Galley & H.P.Linder (2010) | - | 1924 | Pic Ivohibe, Madagascar | Missing | Access |
| Pentameris longiglumis | (Nees) Steud. | (rediscovered) | Table Mountain, South Africa | Missing | Access | |
| Piptophyllum welwitschii | (Rendle) C.E.Hubb. | May 1857 | Pungo-Andongo & Tunda Quilombo, Angola | Missing | Access | |
| Pleuropogon oregonus | Chase | Oregon semaphoregrass | - | Oregon, USA | Rediscovered | Access |
| Poa mannii | Munro ex Hillebr. | (rediscovered) | Kauai, Hawaiian Islands, USA | Rediscovered | Access | |
| Poa norbergii | Hultén | ? | ? | Invalid (synonym) | Access | |
|
Pseudechinolaena camusiana camusiana |
Bosser (1975) | - | 1952 or before | western Madagascar | Missing | Access |
|
Pseudechinolaena camusiana tricistata |
Bosser (1975) | - | 1952 or before | western Madagascar | Missing | Access |
|
Pseudechinolaena moratii |
Bosser (1975) | - | 1964 | Beboha, western Madagascar | Missing | Access |
| Pseudolasiacis bathiei | (A. Camus) A. Camus | 1955 | Madagascar | Missing | Access | |
| Puccinellia gussonei | Parl. (1850) | 2005 | Sicily, Italy | Missing or Invalid (synonym) | Access | |
| Puccinellia pannonica | (Hack.) Holmberg (1920) | ? | Hungary | Extinct | Access | |
| Sartidia perrieri | (A.Camus) | 1914 | Madagascar | Missing | Access | |
| Schaffnerella gracilis | (Benth.) Nash | - | Mexico | Rediscovered | Access | |
|
Schizachyrium djalonicum |
Jacq.-Fél. | - | 1956 | Guinea | Missing | Access |
| Setaria gracillima | Hook.f. (1896) | - | ? | Sri Lanka | Missing or Extinct | Access |
|
Sokinochloa bosseri |
S.Dransf. (2016) | - | 1962 | eastern Madagascar | Missing | Access |
|
Sorghum plumosum teretifolium |
Lazarides (1991) | - | 1959 | Western Australia, Australia | Missing or Invalid (synonym) | Access |
| Sphenopholis interrupta californica | (Vasey) Scribn. | (rediscovered) | Baja California, Mexico & California, USA | Rediscovered | Access | |
|
Sporobolus durus
|
Brongn. | 1886 (1958?) | Green Mountain, Ascension Island, Saint Helena | Extinct | Access | |
| Sporobolus linearis | Mez | ? | Mauritius, Mascarene Islands | ? | Access | |
| Sporobolus mauritianus | (Steud.) T.Durand & Schinz | ? | Mauritius, Mascarene Islands | Invalid (synonym) | Access | |
|
Sporobolus pauciflorus |
A.Chev. | - | 1947 | Guinea | Missing | Access |
| Stipa horridula | Pilg. | 1917 | Rapa Nui (=Easter Island) | Invalid (synonym) | Access | |
|
Stipa tulcanensis |
Mez (1921) | - | very late 1870's | Ecuador | Missing or Unplaced name | Access |
| Streptochaeta angustifolia | Soderstr. | 25 April 1972 | Espírito Santo, Brazil | Extinct in the wild | Access | |
| Sucrea sampaiana | (Hitchc.) Soderstr. | ? | Espírito Santo, Brazil | Missing | Access | |
|
Themeda saxicola |
Bor (1951) | - | (rediscovered) | Koraput district, Odisha, India | Rediscovered | Access |
| Triodia bromoides | (F. Muell.) M. Lazarides, 1997 | (rediscovered) | Western Australia, Australia | Rediscovered | Access | |
|
Triodia prona |
Lazarides (1997) | - | 1963 | Western Australia, Australia | Extinct | Access |
| Triscenia ovina | Griseb. | (rediscovered) | Holguin province, Cuba (eastern) | Rediscovered | Access | |
| Trisetum burnoufii | Req. ex Parl. (1850) | ? | western Europe | Invalid (synonym) | Access | |
|
Trisetum × orthochaetum |
Hitchc. (1934) | Missoula County oats | (rediscovered) | Montana, USA | Rediscovered | Access |
| Trisetopsis quinqueseta | (Steud.) Röser & Wölk | 1800-1850 | Western Cape Province, South Africa | Missing | Access | |
| Triticum parvicoccum | Kislev (1979) | ? | Balkans and Near East | Uncertain | Access | |
|
Valiha perrieri |
(A.Camus) S.Dransf. (1998) | - | 1909 | Andrafiamena, northern Madagascar | Missing | Access |
| Zea mexicana | (Schrad.) Kuntze | (rediscovered) | Mexico | Rediscovered | Access | |
| Zenkeria obtusiflora | (Thwaites) Benth. (1881) | - | ? | Sri Lanka | Missing or Extinct | Access |
Family: Rapateaceae
–No subordinate taxa
Family: Restionaceae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Centrolepis caespitosa | D.A. Cooke, 1980 | - | Western Australia, Australia | Rediscovered | Access | |
| Chordifex chaunocoleus | (F.Muell.) B.G.Briggs & L.A.S.Johnson | (rediscovered) | Western Australia, Australia | Rediscovered | Access | |
| Chordifex jacksonii | L.A.S. Johnson & B.G. Briggs, 2004 | - | Western Australia (southwest), Australia | Rediscovered | Access | |
| Elegia fastigiata | Mast. | ? | Cape Province, South Africa | Missing | Access | |
| Lepyrodia heleocharoides | Gilg | (rediscovered) | Western Australia, Australia | Rediscovered | Access | |
| Willdenowia affinis | Pillans | 1918 | Table Mountain (north slopes, near Kloof Corner), Western Cape Province, South Africa | Missing | Access |
Family: Thurniaceae
–No subordinate taxa
Family: Typhaceae
–No subordinate taxa
Family: Xyridaceae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Xyris andina | Malme | 1861-1863 | Ecuador | Missing | Access | |
| Xyris glandacea | L.A.Nilsson, 1892 | - | Minas Gerais, Brazil | Rediscovered | Access |
Appendix 1: Other papers that may be of interest
Lack, Hans Walter and van Slageren, Michiel. (2020). The discovery, typification and rediscovery of wild emmer wheat, Triticum turgidum subsp. dicoccoides (Poaceae). Willdenowia, 50(2): 207-216. https://doi.org/10.3372/wi.50.50206