This paleobotany list records new fossil plant taxa that were to be described during the year 1952, as well as notes other significant paleobotany discoveries and events which occurred during 1952.
| Name | Novelty | Status | Authors | Age | Unit | Location | Synonymized taxa | Notes | Images |
|---|---|---|---|---|---|---|---|---|---|
| Archaeomnium arnoldianum[1] | Comb nov | jr synonym | (Steere) LaMotte | Miocene | "Carter Creek" | A moss. Moved from Palaeohypnum arnoldianum (1947) Moved to Hypnites arnoldianum in 1980[2] | |||
| Archaeomnium brittoniae | Comb nov | jr synonym | (Steere) LaMotte | Miocene | Latah Formation | A moss. Moved from Palaeohypnum brittoniae (1947) Moved to Hypnites brittoniae in 1980 | |||
| Archaeomnium brownii | Comb nov | jr synonym | (Kirchner) LaMotte | Eocene Priabonian | Florissant Formation | A moss. Moved from Palaeohypnum brownii (1947) First named Hypnum brownii (1898) Moved to Hypnites brownii in 1980 | |||
| Archaeomnium knowltoni | Comb nov | jr synonym | (E. G. Britton) LaMotte | Eocene | Roslyn Formation | A moss. Moved from Palaeohypnum knowltoni (1947) First named Rhynchostegium knowltoni (1899) Moved to Hypnites knowltoni in 1980 | |||
| Name | Novelty | Status | Authors | Age | Unit | Location | Synonymized taxa | Notes | Images |
|---|---|---|---|---|---|---|---|---|---|
| Athyrium crossii | Comb nov | (Knowlton) LaMotte | Paleocene | Denver Formation | Diplaiium mulleri (1874) | A lady fern species. Moved from Diplazium crossii (1930) First named Asplenium (Diplaiium) crossii (1890) | |||
| Cyathea branneri | Comb nov | (Hollick & Berry) LaMotte | "Tertiary" | A tree fern species. Moved from Hemitelia branneri (1924) | |||||
| Cyathea pinnata | Comb nov | jr synonym | (MacGinitie) LaMotte | Eocene | Ione Formation | A tree fern species. Moved from Hemitelia pinnata (1941) Synonymized into Cyathea inequilateralis in 1977[3] | |||
| Dryopteris claiborniana | Comb nov | (Berry) LaMotte | Eocene | Yegua Formation | A wood fern species Moved from Goniopteris claiborniana (1917) | ||||
| Dryopteris escheri | Comb nov | (Heer) LaMotte | Miocene | A wood fern species Moved from Aspidium escheri (1855) | |||||
| Dryopteris guyottii | Comb nov | (Lesquereux) LaMotte | Eocene Priabonian | Florissant Formation | A wood fern species Moved from Phegopteris guyottii (1908) First named Sphenopteris guyottii (1883) | ||||
| Dryopteris heerii | Comb nov | (Ettingshausen) LaMotte | A wood fern species Moved from Aspidium heerii (1865) | ||||||
| Dryopteris lesquereuxi | Comb nov | (Berry) LaMotte | Eocene | Lysite Formation | A wood fern species Moved from Goniopteris lesquereuxi (1932) | ||||
| Dryopteris ursinum | Comb nov | (Unger) LaMotte | Miocene | A wood fern species Moved from Lastrea (Phegopteris) stiriaca (1855) | |||||
| Dryopteris ursinum | Comb nov | (Heer) LaMotte | Paleocene | A wood fern species Moved from Aspidium ursinum (1869) | |||||
| Name | Novelty | Status | Authors | Age | Unit | Location | Synonymized taxa | Notes | Images |
|---|---|---|---|---|---|---|---|---|---|
| Ctenis hamiltonensis | Comb nov | (Hollick) LaMotte | Paleocene/Eocene | "Hamilton Bay flora" | A Ctenis species. Moved from Anthrophyopsis hamiltonensis (1936)[4] | ||||
| Zamites pollardi | Comb nov | (Hollick) LaMotte | Paleocene | Fort Union Formation | A Zamites species morphospecies. Moved from Magnolia (?) pollardi (1899) | ||||
| Name | Novelty | Status | Authors | Age | Unit | Location | Synonymized taxa | Notes | Images |
|---|---|---|---|---|---|---|---|---|---|
| Callitris helvetica | Comb nov | (Heer) LaMotte | Miocene | A Callitris species. Moved from Widdringtonia helvetica (1855) | |||||
| Juniperus linguaefolia | Comb nov | (Lesquereux) LaMotte | Eocene Priabonian | Florissant Formation | A juniper species. Moved from Sabina linguaefolia (1908) First described as Widdringtonia linguaefolia (1883) | ||||
| Thuja naujatica | Comb et sp nom nov | (Heer) LaMotte | Paleocene |  Greenland | A hiba species. New species name for Thujopsis gracilis (1920) First described as Thuja (Thujopsis) gracilis (Heer) (1883) | ||||
| Name | Novelty | Status | Authors | Age | Unit | Location | Synonymized taxa | Notes | Images |
|---|---|---|---|---|---|---|---|---|---|
| Nymphaea leei | Comb nov | (Knowlton) LaMotte | Paleocene | Raton Formation | A waterlily species First described as Castalia leei (1917) | ||||
| Nymphaea pulchella | Comb nov | (Knowlton) LaMotte | Paleocene | Dawson Arkose | A waterlily species First described as Castalia pulchella (1930) | ||||
| Name | Novelty | Status | Authors | Age | Unit | Location | Synonymized taxa | Notes | Images |
|---|---|---|---|---|---|---|---|---|---|
| Beilschmiedia portoricensis | Comb nov | (Hollick) LaMotte | Miocene | Collazo Shale | A Beilschmiedia species. Moved from Hufetandta portoricensis (1928) First named Aniba portoricensis (1928) | ||||
| Laurophyllum grandis | Comb nov | (Lesquereux) LaMotte | Miocene | Neroly Formation | A lauraceous species. Moved from Laurus grandis (1883) | ||||
| Lindera antiqua | Comb nov | (Heer) LaMotte | Miocene | A spicewood species First described as Benzoin antiquum (1856) | |||||
| Lindera dilleri | Comb nov | (Knowlton) LaMotte | Miocene | A spicewood species First described as Benzoin dilleri (1900) | |||||
| Litsea lamarensis | Comb nov | (Knowlton) LaMotte | Eocene | A Litsea species First described as Malapoenna lamarensis (1899) | |||||
| Litsea lata | Comb nov | jr synonym | (MacGinitie) LaMotte | Eocene | Ione Formation | A lauraceous relative First described as Neolitsea lata (1941) Moved to Cinnamomophyllum latum in 1977 | |||
| Litsea praecursoria | Comb nov | (Lesquereux) LaMotte | Paleocene | Fort Union Formation | A lauraceous relative First described as Tetranthera praecursoria (1883) | ||||
| Litsea sagittata | Comb nov | (Ball) LaMotte | Eocene | Wilcox Formation | A Litsea species First described as Malapoenna sagittata (1939) | ||||
| Litsea sessiliflora | Comb nov | (Lesquereux) LaMotte | Eocene | Wilcox Formation |
| A Litsea species Moved from Malapoenna sessiliflora (1898) First described as Laurus sessiliflora (1874) | |||
| Litsea texensis | Comb nov | (Ball) LaMotte | Eocene | Indio Formation | A Litsea species First described as Malapoenna sagittata (1931) | ||||
| Ocotea alia | Sp nom nov | LaMotte | Eocene | Wilcox Formation |
| An Ocotea species A replacement name for Mespilodaphne coushatta (Berry, 1916) (1916) | |||
| Ocotea athenensis | Comb nov | (Ball) LaMotte | Eocene | Wilcox Formation | An Ocotea species Moved from Mespilodaphne athenensis (1939) | ||||
| Ocotea attenuata | Comb nov | (Ball) LaMotte | Eocene | Wilcox Formation | An Ocotea species Moved from Mespilodaphne attenuata (1939) | ||||
| Ocotea berryana | Sp nom nov | LaMotte | Eocene | Lagrange Formation | An Ocotea species A replacement name for Mespilodaphne puryearensis (Berry, 1916) (1916) | ||||
| Ocotea brazosensis | Comb nov | (Ball) LaMotte | Eocene | Fayette Formation | An Ocotea species Moved from Oreodaphne brazosensis (1924) | ||||
| Ocotea caudata | Comb nov | (Berry) LaMotte | Eocene | Mount Selman Formation |  United States | An Ocotea species Moved from Mespilodaphne caudata (1924) Includes one subspecies moved from M. c. major | |||
| Ocotea collazoensis | Comb nov | (Hollick) LaMotte | Miocene | Collazo Shales | An Ocotea species Moved from Aniba collazoensis (1928) | ||||
| Ocotea coloradensis | Comb nov | (Brown) LaMotte | Eocene | Green River Formation | An Ocotea species Moved from Oreodaphne coloradensis (1934) | ||||
| Ocotea columbiana | Comb nov | (Hollick) LaMotte | Eocene | Lisbon Formation | An Ocotea species Moved from Mespilodaphne columbiana (1924) | ||||
| Ocotea coushatta | Comb nov | (Berry) LaMotte | Eocene | Wilcox Formation |
| An Ocotea species Moved from Oreodaphne coushatta (1916) | |||
| Ocotea culebrensis | Comb nov | (Berry) LaMotte | Oligocene | Culebra Formation | An Ocotea species Moved from Mespilodaphne columbiana (1924) | ||||
| Ocotea eolignitica | Comb nov | (Hollick) LaMotte | Eocene | An Ocotea species Moved from Mespilodaphne eolignitica (1916) First named Andromeda eolignitica (1899) | |||||
| Ocotea hispanioiana | Comb nov | (Berry) LaMotte | Miocene | Arbitonite Group | An Ocotea species Moved from Mespilodaphne hispanioiana (1922) | ||||
| Ocotea inequilateralis | Comb nov | (Berry) LaMotte | Eocene | Gosport Formation | An Ocotea species Moved from Mespilodaphne inequilateralis (1924) | ||||
| Ocotea intermedia | Comb nov | (Berry) LaMotte | Eocene | Holly Springs Formation | An Ocotea species Moved from Mespilodaphne intermedia (1930) | ||||
| Ocotea lancifolia | Comb nov | (Lesquereux) LaMotte | Eocene Ypresian | Holly Springs Formation |
| An Ocotea species Moved from Oreodaphne lancifolia (1934) First described as Sapindus lancifolius (1883) | |||
| Ocotea lithaeformis | Comb nov | (Lesquereux) LaMotte |
| An Ocotea species Moved from Mespilodaphne lithaeformis (1888) | |||||
| Ocotea mississippiensis | Comb nov | (Berry) LaMotte | Eocene | Holly Springs Formation |
| An Ocotea species Moved from Mespilodaphne lithaeformis (1916) | |||
| Ocotea obtusifolia | Comb nov | (Berry) LaMotte | Eocene | Holly Springs Formation |
| An Ocotea species Moved from Oreodaphne obtusifolia (1916) | |||
| Ocotea pagosensis | Comb nov | (Hollick) LaMotte | Paleocene | Animas Formation | An Ocotea species Moved from Oreodaphne pagosensis (1924) | ||||
| Ocotea palomarensis | Comb nov | (Berry) LaMotte | Miocene | An Ocotea species Moved from Mespilodaphne obtusifolia (1923) | |||||
| Ocotea perseaformis | Comb nov | (Ball) LaMotte | Eocene | Indio Formation | An Ocotea species Moved from Oreodaphne perseaformis (1939) | ||||
| Ocotea praefracta | Comb nov | (Ball) LaMotte | Eocene | Wilcox Formation | An Ocotea species Moved from Oreodaphne praefracta (1939) | ||||
| Ocotea precoushatta | Comb nov | (Berry) LaMotte | Eocene | Indio Formation | An Ocotea species Moved from Mespilodaphne perseaformis (1924) | ||||
| Ocotea pseudoglauca | Comb nov | (Berry) LaMotte | Eocene | Wilcox Formation | An Ocotea species Moved from Mespilodaphne pseudoglauca (1916) | ||||
| Ocotea pseudoguianensis | Comb nov | (Berry) LaMotte | Eocene | Wilcox Formation | An Ocotea species Moved from Mespilodaphne pseudoguianensis (1916) | ||||
| Ocotea puryearensis | Comb nov | (Berry) LaMotte | Eocene | Ackerman Formation | An Ocotea species Moved from Oreodaphne pseudoguianensis (1916) | ||||
| Ocotea (?) ratonensis | Comb nov | (Hollick) LaMotte | Paleocene | Raton Formation | An Ocotea species Moved from Oreodaphne (?) ratonensis (1917) | ||||
| Ocotea ripariafolia | Comb nov | (Berry) LaMotte | Miocene | Forest Clay Formation | An Ocotea species Moved from Aniba ripariafolia (1937) | ||||
| Ocotea salinensis | Comb nov | (Berry) LaMotte | Eocene | Wilcox Formation | An Ocotea species Moved from Oreodaphne salinensis (1916) | ||||
| Ocotea tertiaria | Comb nov | (Berry) LaMotte | An Ocotea species Moved from Goeppertia tertiaria (1921) | ||||||
| Ocotea texana (Berry) | Comb nov | Homonym | (Berry) LaMotte | Eocene | Fayette Formation | An Ocotea species Moved from Mespilodaphne texana (1924) Homonym with Ocotea texana (Ball) | |||
| Ocotea texana (Ball) | Comb nov | Homonym | (Ball) LaMotte | Eocene | Indio Formation | An Ocotea species Moved from Oreodaphne texana (1931) Homonym with Ocotea texana (Berry) | |||
| Ocotea viridiflumensis | Comb nov | (Knowlton) LaMotte | Eocene | Green River Formation | An Ocotea species Moved from Oreodaphne coloradensis (1923) | ||||
| Ocotea wilcoxensis | Comb nov | (Berry) LaMotte | Eocene | Wilcox Formation | An Ocotea species Moved from Oreodaphne wilcoxensis (1916) | ||||
| Sassafras quilchenensis | Sp nom nov | LaMotte | Eocene Ypresian | Eocene Okanagan Highlands Coldwater Beds | A Sassafras species A new name for Sassafras cretaceum (Penhallow) (1906) | ||||
| Umbellularia saliciformis | Comb nov | (Knowlton & Cockerell) LaMotte | Miocene | Neroly Formation | A California bay species Moved from Laurus saliciformis (1919) First named Laurus salicifolia (Lesquereux) (1883) L. salicifolia a jr homonym of Laurus salicifolia (Banks & Solander) | ||||
| Name | Novelty | Status | Authors | Age | Unit | Location | Synonymized taxa | Notes | Images |
|---|---|---|---|---|---|---|---|---|---|
| Cyperacites islandicus | Comb nov | (Heer) LaMotte | Paleocene | A Cyperacites morphospecies Moved from Cyperites islandicus (1868) | |||||
| Exflabellaria | Gen et 4 comb nov | Jr synonym | LaMotte | A palm leaf morphogenus Replacement genus for the homonym Flabellaria (Sternberg) (1822) Jr synonym of Palmacites Contained Flabellaria alaskana, F. groenlandica, F. johnstrupi, & F. latania | |||||
| Potamogeton orbus | Sp nom nov | LaMotte | Miocene | Latah Formation | A possible pond weed species New name for referred "Potamogeton heterophylloides" fossils P. heterophylloides type specimens moved to Keteleeria heterophylloides (1940) | ||||
| Name | Novelty | Status | Authors | Age | Unit | Location | Synonymized taxa | Notes | Images |
|---|---|---|---|---|---|---|---|---|---|
| Nelumbium crossii | Comb nov | (Knowlton) LaMotte | Paleocene | Arapahoe Formation | A lotus relative. Moved from Nelumbo crossii (1930) | ||||
| Nelumbium protolutea | Comb nov | (Berry) LaMotte | Eocene | Wilcox Formation |
| A lotus relative. Moved from (1949) Nelumbites protoluteus First named Nelumbo protolutea (1917) | |||
| Name | Novelty | Status | Authors | Age | Unit | Location | Synonymized taxa | Notes | Images |
|---|---|---|---|---|---|---|---|---|---|
| Achras agnitionalis | Comb nov | (Hollick) LaMotte | Miocene | Collazo Shale | A Manilkara species. Moved from Sapota agnitionalis (1928) | ||||
| Arbutus xalapoldes | Sp nom nov | LaMotte | Pliocene | A madrone. New name for "Arbutus prexalapensis" (1950) madrone fossils Type material of A. prexalapensis moved to other species | |||||
| Ardisia prepaniculata | Comb nov | (Berry) LaMotte | Eocene | Wilcox Formation | A marlberry species. Moved from Icacorea prepaniculata (1916) | ||||
| Ardisia prisca | Comb nov | (Hollick) LaMotte | Miocene | Collazo Shale | A marlberry species. Moved from Icacorea prisca (1924) | ||||
| Asclepias fructifer | Comb nov | (Cockerell) LaMotte | Eocene Priabonian | Florissant Formation | A milkweed species. Moved from Acerates fructifer (1908) | ||||
| Asclepias veterana | Comb nov | (Heer) LaMotte | Miocene | A milkweed species. Moved from Acerates veterana (1859) | |||||
| Asclepias wilcoxiana | Comb nov | (Berry) LaMotte | Eocene | Wilcox Formation | A milkweed species. Moved from Acerates wilcoxiana (1930) | ||||
| Coccoloba chapini | Comb nov | (Hollick) LaMotte | Paleocene/Eocene | Matanuska coal field | A Coccoloba species. Moved from Coccolobis chapini (1936) | ||||
| Coccoloba claibornensis | Comb nov | (Berry) LaMotte | Eocene | Gosport Formation | A Coccoloba species. Moved from Coccolobis claibornensis (1924) | ||||
| Coccoloba columbianus | Comb nov | (Berry) LaMotte | Eocene | Yegua Formation | A Coccoloba species. Moved from Coccolobis columbianus (1924) | ||||
| Coccoloba eolignitica | Comb nov | (Berry) LaMotte | Eocene | Lagrange Formation | A Coccoloba species. Moved from Coccolobis columbianus (1916) | ||||
| Coccoloba uviferafolia | Comb nov | (Berry) LaMotte | Eocene | Lagrange Formation | A Coccoloba species. Moved from Coccolobis uviferafolia (1916) | ||||
| Cryptantha auriculata | Comb nov | (Elias) LaMotte | Pliocene | Ogallala Formation | United States | A Cryptantha species. Moved from Krynitikia auriculata (1932) | |||
| Cryptantha chaneyi | Comb nov | (Elias) LaMotte | Pliocene | Ogallala Formation | United States | A Cryptantha species. Moved from Krynitzkia (Oreocarya) chaneyi (1932) | |||
| Cryptantha coroniformis | Comb nov | (Elias) LaMotte | Pliocene | Ogallala Formation | United States | A Cryptantha species. Moved from Krynitzkia (Oreocarya) coroniformis (1932) | |||
| Gonolobus (?) trinervatus | Comb nov | (MacGinitie) LaMotte | Miocene | Trout Creek Flora | An asclepiadoid milkweed family species Moved from Vincetoxicum (?) trinervata (1933) | ||||
| Halesia inopinum | Comb nov | (Hollick) LaMotte | Paleocene | Berg lake Formation | A snowdrop tree species Moved from Mohrodendron inopinum (1936) | ||||
| Leiophyllum pleistocenicum | Comb nov | (Berry) LaMotte | Pleistocene | A sandmyrtle species First described as Dendrium pleistocenicum (1907) | |||||
| Viburnum comstocki | Comb nov | (Sanborn) LaMotte | Eocene | A Viburnum species First described as Mallotus comstocki (1935) | |||||
| Name | Novelty | Status | Authors | Age | Unit | Location | Synonymized taxa | Notes | Images |
|---|---|---|---|---|---|---|---|---|---|
| Acer (Negundo) decurrens | Comb nov | (Lesquereux) LaMotte | Paleocene | Denver Formation | A maple. Moved from Negundo decurrens (1888) | ||||
| Acer (Negundo) fremontensis | Comb nov | (Berry) LaMotte | Eocene | Bridger Formation | A maple. Moved from Negundo fremontensis (1930) | ||||
| Acer negundifolium | Comb nov | (Dawson) LaMotte | Eocene (Ypresian) | Eocene Okanagan Highlands Stump lake | A possible maple. Moved from Acerites negundifolium (1891) | ||||
| Acer orbum | Sp nom nov | LaMotte | Eocene | Ione Formation | A maple. New name for Acer aequidentatum maple fossils A. aequidentatum type fossils moved to Platanus appendiculata | ||||
| Acer (Negundo) triloba | Comb nov | (Newberry) LaMotte | Paleocene | Fort Union Formation | A maple. Moved from Negundo triloba (1868) | ||||
| Acer tuckeri | Comb nov | (Smith) LaMotte | Pliocene | "Hog Creek" | A maple. Moved from Engdhardtia tuckeri (1938) | ||||
| Canarium leonis | Comb nov | (Cockerell) LaMotte | Eocene | Ione Formation | A Canarium species. Moved from Juglans leonis (1908) | ||||
| Carya bartoni | Comb nov | (Ball) LaMotte | Eocene | A hicory species. Moved from Hicoria bartoni (1931) | |||||
| Carya biacuminata | Comb nov | (Perkins) LaMotte | Eocene | Brandon lignites | A hicory species. Moved from Hicoria biacuminata (1904) | ||||
| Carya crescentia | Comb nov | (Knowlton) LaMotte | Paleocene | A hickory species. Moved from Hicoria crescentia (1899) | |||||
| Carya culveri | Comb nov | (Knowlton) LaMotte | Paleocene | A hickory species. Moved from Hicoria culveri (1899) | |||||
| Carya dawsoni | Comb nov | valid | (Berry) LaMotte | Early Eocene (Ypresian) | Okanagan Highlands Chu Chua Formation | A hickory. Moved from Hicoria dawsoni (1962) | |||
| Carya dentata | Comb nov | (Knowlton) LaMotte | Paleocene | A hickory species. Moved from Hicoria culveri (1899) | |||||
| Carya jacksoniana | Comb nov | (Berry) LaMotte | Eocene | Yegua Formation | A hickory species. Moved from Hicoria jacksoniana (1924) | ||||
| Carya juxtaporipites | Comb nov | (Berry) LaMotte | Eocene Ypresian | Green River Formation | A hickory species. Moved from Hicoria juxtaporipites (1933) | ||||
| Carya (?) oregoniana | Comb nov | (Knowlton) LaMotte | Eocene | Clarno Formation | A hickory species. Moved from Hicoria (?) oregoniana (1902) | ||||
| Carya orientalis | Comb nov | (Chaney) LaMotte | Oligocene | Eagle Creek flora | A hickory species. Moved from Hicoria orientalis (1920) | ||||
| Carya pretexana | Comb nov | (Berry) LaMotte | Pliocene | Citronelle Formation | A hickory species. Moved from Hicoria pretexana (1916) | ||||
| Carya princetoniana | Comb nov | (Cockerell) LaMotte | Eocene Priabonian | Florissant Formation | A hickory species. Moved from Hicoria princetoniana (1908) | ||||
| Carya rostrataformis | Comb nov | (Berry) LaMotte | Eocene | Lagrange Formation | A hickory species. Moved from Hicoria rostrataformis (1924) | ||||
| Carya stanleyanum | Comb nov | valid | (Dawson) LaMotte | Early Eocene (Ypresian) | Huntingdon Formation | A hickory. Moved from Hicoria dawsoni (1962) First named Dryophyllum stanleyanum (1895) | |||
| Carya williamsi | Comb nov | (Chaney) LaMotte | Oligocene | Eagle Creek flora | A hickory species. Moved from Hicoria williamsi (1920) | ||||
| Celtis americana | Comb nov | (Berry) LaMotte | Eocene | McBean Formation | Mimosa americana (1919) | A Celtis species. Moved from Momisia americana (1914) | |||
| Cercidiphyllum piperoides | Comb nov | (Lesquereux) LaMotte | Eocene | Ione Formation | A katsura species. Moved from Zizyphus piperoides (1878) Moved to Tetracentron piperoides in 1977 | ||||
| Comptonia parvula | Comb nov | (Heer) LaMotte | Cretaceous | Patoot beds | A Comptonia species. Moved from Myrica (Comptonia) parvula (1916) | ||||
| Cupanites berryi | Sp nom nov | LaMotte | Eocene | Barnwell Formation | A sapindaceous Cupanites species. A new name for Cupanites nigricans (1918) | ||||
| Inga alia | Sp nom nov | LaMotte | Miocene | An ice-cream-bean species A new species name for Inga miocenica (Berry, 1939) (1939) | |||||
| Liquidambar dubia | Sp nom nov | (Berry) LaMotte | Eocene | Lagrange Formation | A sweetgum species A replacement name for Liquidambar incerta (Berry, 1924) (1924) | ||||
| Macrolobium geminifolia | Comb nov | (MacGinitie) LaMotte | Eocene | Ione Formation | A Macrolobium species legume. Moved from Vouapa geminifolia (1941) | ||||
| Melastomites incertus | Sp nom nov | LaMotte | Oligocene | Culebra Formation | A melastome species A replacement name for Melastomites miconioides (Berry, 1919) (1919) | ||||
| Populus americana | Comb nov | (Lesquereux) LaMotte | Eocene Priabonian | Florissant Formation | A cottonwood species. Moved from Pterocarya americana (1874) | ||||
| Populus (?) paramonodon | Sp nom nov | LaMotte | Paleocene | A possible cottonwood species New name for referred "Populus monodon" fossils P. monodon type specimens moved to Ficus monodon | |||||
| Prunus gracilis (Lesquereux) | Comb nov | Jr homonym | (Lesquereux) LaMotte | Eocene Pribonian | Florissant Formation |
| A possible cherry species Moved from Amygdalus gracilis (1883) Jr homonym of Prunus gracilis (Engelm. & A.Gray) | ||
| Prunus wilcoxiana | Comb nov | (Berry) LaMotte | Eocene | Tallahatta Formation Holly Springs Sand Member | A possible cherry species Moved from Amygdalus wilcoxiana (1930) | ||||
| Pyrus alvordensis | Comb nov | (MacGinitie) LaMotte | Trout Creek flora | A possible mountain ash species Moved from Sorbus alvordensis (1933) | |||||
| Pyrus coronariafolia | Comb nov | (Berry) LaMotte | Pleistocene | A possible apple species Moved from Malus coronariafolia (1907) | |||||
| Pyrus decorafolia | Comb nov | (Berry) LaMotte | Eocene (Ypresian) | Okanagan Highlands Chu Chua Formation | A possible mountain ash species Moved from Sorbus decorafolia (1926) | ||||
| Pyrus diversifolia (Lesquereux) | Comb nov | Jr homonym | (Lesquereux) LaMotte | Eocene (Priabonian) | Florissant Formation | A possible mountain ash species Moved from Sorbus diversifolia (1918) First named Myrica diversifolia (1883) homonym of Pyrus diversifolia Bong. | |||
| Pyrus grandifolia | Comb nov | (Heer) LaMotte | Paleocene | A possible mountain ash species Moved from Sorbus grandifolia (1869) | |||||
| Pyrus harneyensis | Comb nov | (Axelrod) LaMotte | Pliocene | A possible mountain ash species Moved from Sorbus harneyensis (1944) | |||||
| Pyrus idahoensis | Comb nov | (Brown) LaMotte | Oligocene | Salmon flora | A possible apple species Moved from Malus idahoensis (1935) | ||||
| Pyrus megaphylla | Comb nov | (Cockerell) LaMotte | Eocene Priabonian | Florissant Formation | A possible mountain ash species Moved from Sorbus megaphylla (1908) | ||||
| Pyrus nupta | Comb nov | (Cockerell) LaMotte | Eocene Priabonian | Florissant Formation |
| A possible mountain ash species Moved from Sorbus nupta (1910) | |||
| Pyrus pseudoangustifolla | Comb nov | (Berry) LaMotte | Pliestocene | A possible apple species Moved from Malus pseudoangustifolla (1910) | |||||
| Shepherdia weaveri | Comb nov | (Hollick) LaMotte | Paleocene - Eocene | "Kachemak Bay flora" | A possible buffaloberry species Moved from Lepargyraea weaveri (1936) | ||||
| Sphaeralcea (?) exhumatum | Comb nov | (Cockerell) LaMotte | Eocene Priabonian | Florissant Formation | A possible globemallow species Moved from Malvastrum (?) exhumatum (1906) | ||||
| Ulmus chuchuanus | Sp nom nov | valid | (Berry) LaMotte | Eocene (Ypresian) | Okanagan Highlands Chu Chua Formation | An elm. New name for "Ulmus columbianus" Berry (1926) Junior homonym of "Ulmus columbiana" Penhallow (1907) | |||
| Xanthoxylum alia | Sp nom nov | LaMotte | Miocene | A possible Zanthoxylum species New name for Fagara miocenica Berry, 1939) (1939) F. miocenica a jr homonym of Fagara miocenica (Berry, 1925) | |||||
| Xanthoxylum apalachacolensis | Comb nov | (Berry) LaMotte | Miocene | Alum Bluff Formation | A possible Zanthoxylum species Moved from Fagara apalachacolensis (1916) | ||||
| Xanthoxylum catahoulensis | Comb nov | (Berry) LaMotte | Eocene | Catahoula Formation | A possible Zanthoxylum species Moved from Fagara catahoulensis (1916) 4 varieties also moved F. c. corlacea, F. c. elongata, F. c. major, & F. c. orbiculata | ||||
| Xanthoxyium claibornensis | Comb nov | (Berry) LaMotte | Eocene | Mount Selman Formation | A possible Zanthoxylum species Moved from Fagara claibornensis (1924) | ||||
| Xanthoxyium (?) delicatula | Comb nov | (Cockerell) LaMotte | Eocene Priabonian | Florissant Formation | A possible Zanthoxylum species Moved from Fagara (?) delicatula (1908) | ||||
| Xanthoxylum dubium | Comb nov | nomen nudum | (Lesquereux) LaMotte | Paleocene | Raton Formation | A possible Zanthoxylum species Moved from Zanthoxylum dubium (1872) Considered nomen nudum by LaMotte | |||
| Xanthoxylum eocenica | Comb nov | (Berry) LaMotte | Eocene | Lagrange Formation | A possible Zanthoxylum species Moved from Fagara eocenica (1916) | ||||
| Xanthoxylum juglandianum | Comb nov | (Braun) LaMotte | "Tertiary" | A possible Zanthoxylum species Moved from Zanthoxylum juglandianum (1878) | |||||
| Xanthoxylum miocenica | Comb nov | (Berry) LaMotte | Miocene | Forest Sand Formation | A possible Zanthoxylum species Moved from Fagara miocenica (1925) | ||||
| Xanthroxylum petraflumensis | Comb nov | (Berry) LaMotte | Eocene | Yegua Formation | A possible Zanthoxylum species Moved from Fagara petraflumensis (1924) | ||||
| Xanthoxylum puryearensis | Comb nov | (Berry) LaMotte | Eocene | Lagrange Formation | A possible Zanthoxylum species Moved from Fagara eocenica (1916) | ||||
| Xanthoxyium spireaefolia | Comb nov | (Lesquereux) LaMotte | Eocene Priabonian | Florissant Formation | A possible Zanthoxylum species Moved from Fagara spireaefolia (1908) First named Zanthoxylum spireaefolium (1883) | ||||
| Xanthoxylum wadii | Comb nov | (Berry) LaMotte | Miocene | A possible Zanthoxylum species Moved from Fagara wadii (1923) | |||||
| Xanthoxylum wyomingensis | Comb nov | (Berry) LaMotte | Eocene | Bridger Formation | A possible Zanthoxylum species Moved from Fagara wyomingensis (1930) | ||||