# 1952 in paleobotany

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.

## Mosses

| Name | Novelty | Status | Authors | Age | Unit | Location | Notes |
| Archaeomnium arnoldianum | Comb nov | jr synonym | (Steere) LaMotte | Miocene | "Carter Creek" | United States Oregon | A moss. Moved from Palaeohypnum arnoldianum (1947) Moved to Hypnites arnoldianum in 1980 |
| Archaeomnium brittoniae | Comb nov | jr synonym | (Steere) LaMotte | Miocene | Latah Formation | United States Washington | 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 | United States Colorado | 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 | United States Washington | A moss. Moved from Palaeohypnum knowltoni (1947) First named Rhynchostegium knowltoni (1899) Moved to Hypnites knowltoni in 1980 |

## Ferns

| Name | Novelty | Status | Authors | Age | Unit | Location | Synonymized taxa | Notes | Images |
| Athyrium crossii | Comb nov | | (Knowlton) LaMotte | Paleocene | Denver Formation | United States Colorado | 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" | | Brazil | | A tree fern species. Moved from Hemitelia branneri (1924) | |
| Cyathea pinnata | Comb nov | jr synonym | (MacGinitie) LaMotte | Eocene | Ione Formation | United States California | | A tree fern species. Moved from Hemitelia pinnata (1941) Synonymized into Cyathea inequilateralis in 1977 | Cyathea inequilateralis |
| Dryopteris claiborniana | Comb nov | | (Berry) LaMotte | Eocene | Yegua Formation | United States Louisiana | | A wood fern species Moved from Goniopteris claiborniana (1917) | |
| Dryopteris escheri | Comb nov | | (Heer) LaMotte | Miocene | | Switzerland | | A wood fern species Moved from Aspidium escheri (1855) | |
| Dryopteris guyottii | Comb nov | | (Lesquereux) LaMotte | Eocene Priabonian | Florissant Formation | United States Colorado | | 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 | United States Wyoming | synonymy Lastrea (Goniopteris) fischeri (1883) pro part Lastrea (Goniopteris) knightiana (1883) nomen nudum | A wood fern species Moved from Goniopteris lesquereuxi (1932) | |
| Dryopteris ursinum | Comb nov | | (Unger) LaMotte | Miocene | | Switzerland | | A wood fern species Moved from Lastrea (Phegopteris) stiriaca (1855) | |
| Dryopteris ursinum | Comb nov | | (Heer) LaMotte | Paleocene | | Greenland | | A wood fern species Moved from Aspidium ursinum (1869) | |

## Cycadophytes

| Name | Novelty | Status | Authors | Age | Unit | Location | Synonymized taxa | Notes | Images |
| Ctenis hamiltonensis | Comb nov | | (Hollick) LaMotte | Paleocene/Eocene | "Hamilton Bay flora" | USA Alaska | | A Ctenis species. Moved from Anthrophyopsis hamiltonensis (1936) | |
| Zamites pollardi | Comb nov | | (Hollick) LaMotte | Paleocene | Fort Union Formation | USA Wyoming | | A Zamites species morphospecies. Moved from Magnolia (?) pollardi (1899) | |

## Conifers
### Cupressaceae

| Name | Novelty | Authors | Age | Unit | Location | Notes |
| Callitris helvetica | Comb nov | (Heer) LaMotte | Miocene | | Switzerland | A Callitris species. Moved from Widdringtonia helvetica (1855) |
| Juniperus linguaefolia | Comb nov | (Lesquereux) LaMotte | Eocene Priabonian | Florissant Formation | USA Colorado | A juniper species. Moved from Sabina linguaefolia (1908) First described as Widdringtonia linguaefolia (1883) |
| Thuja naujatica | Comb et sp nom nov | (Heer) LaMotte | Paleocene | | Denmark Greenland | A hiba species. New species name for Thujopsis gracilis (1920) First described as Thuja (Thujopsis) gracilis (Heer) (1883) |

## Flowering plants
### Nymphales

| Name | Novelty | Status | Authors | Age | Unit | Location | Synonymized taxa | Notes | Images |
| Nymphaea leei | Comb nov | | (Knowlton) LaMotte | Paleocene | Raton Formation | USA Colorado | | A waterlily species First described as Castalia leei (1917) | |
| Nymphaea pulchella | Comb nov | | (Knowlton) LaMotte | Paleocene | Dawson Arkose | USA Colorado | | A waterlily species First described as Castalia pulchella (1930) | |

### Magnoliids

| Name | Novelty | Status | Authors | Age | Unit | Location | Synonymized taxa | Notes | Images |
| Beilschmiedia portoricensis | Comb nov | | (Hollick) LaMotte | Miocene | Collazo Shale | USA Puerto Rico | | A Beilschmiedia species. Moved from Hufetandta portoricensis (1928) First named Aniba portoricensis (1928) | |
| Laurophyllum grandis | Comb nov | | (Lesquereux) LaMotte | Miocene | Neroly Formation | USA California | synonymy Laurus fremontensis (1930) Laurophyllum fremontensis (1941) | A lauraceous species. Moved from Laurus grandis (1883) | |
| Lindera antiqua | Comb nov | | (Heer) LaMotte | Miocene | | Switzerland | | A spicewood species First described as Benzoin antiquum (1856) | |
| Lindera dilleri | Comb nov | | (Knowlton) LaMotte | Miocene | | USA Oregon | | A spicewood species First described as Benzoin dilleri (1900) | |
| Litsea lamarensis | Comb nov | | (Knowlton) LaMotte | Eocene | | USA Wyoming | | A Litsea species First described as Malapoenna lamarensis (1899) | |
| Litsea lata | Comb nov | jr synonym | (MacGinitie) LaMotte | Eocene | Ione Formation | USA California | | A lauraceous relative First described as Neolitsea lata (1941) Moved to Cinnamomophyllum latum in 1977 | Cinnamomophyllum latum |
| Litsea praecursoria | Comb nov | | (Lesquereux) LaMotte | Paleocene | Fort Union Formation | USA North Dakota | | A lauraceous relative First described as Tetranthera praecursoria (1883) | |
| Litsea sagittata | Comb nov | | (Ball) LaMotte | Eocene | Wilcox Formation | USA Texas | | A Litsea species First described as Malapoenna sagittata (1939) | |
| Litsea sessiliflora | Comb nov | | (Lesquereux) LaMotte | Eocene | Wilcox Formation | USA Texas | Tetranthera sessiliflora (1878) | A Litsea species Moved from Malapoenna sessiliflora (1898) First described as Laurus sessiliflora (1874) | |
| Litsea texensis | Comb nov | | (Ball) LaMotte | Eocene | Indio Formation | USA Texas | | A Litsea species First described as Malapoenna sagittata (1931) | |
| Ocotea alia | Sp nom nov | | LaMotte | Eocene | Wilcox Formation | USA Arkansas | Andromeda delicatida (of Hollick, 1899) | An Ocotea species A replacement name for Mespilodaphne coushatta (Berry, 1916) (1916) | |
| Ocotea athenensis | Comb nov | | (Ball) LaMotte | Eocene | Wilcox Formation | USA Texas | | An Ocotea species Moved from Mespilodaphne athenensis (1939) | |
| Ocotea attenuata | Comb nov | | (Ball) LaMotte | Eocene | Wilcox Formation | USA Texas | | An Ocotea species Moved from Mespilodaphne attenuata (1939) | |
| Ocotea berryana | Sp nom nov | | LaMotte | Eocene | Lagrange Formation | USA Tennessee | | An Ocotea species A replacement name for Mespilodaphne puryearensis (Berry, 1916) (1916) | |
| Ocotea brazosensis | Comb nov | | (Ball) LaMotte | Eocene | Fayette Formation | USA Texas | | An Ocotea species Moved from Oreodaphne brazosensis (1924) | |
| Ocotea caudata | Comb nov | | (Berry) LaMotte | Eocene | Mount Selman Formation | USA Texas | | 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 | USA Puerto Rico | | An Ocotea species Moved from Aniba collazoensis (1928) | |
| Ocotea coloradensis | Comb nov | | (Brown) LaMotte | Eocene | Green River Formation | USA Colorado | | An Ocotea species Moved from Oreodaphne coloradensis (1934) | |
| Ocotea columbiana | Comb nov | | (Hollick) LaMotte | Eocene | Lisbon Formation | USA Mississippi | | An Ocotea species Moved from Mespilodaphne columbiana (1924) | |
| Ocotea coushatta | Comb nov | | (Berry) LaMotte | Eocene | Wilcox Formation | USA Louisiana | Tetrantkera praecursoria (of Hollick, 1899) | An Ocotea species Moved from Oreodaphne coushatta (1916) | |
| Ocotea culebrensis | Comb nov | | (Berry) LaMotte | Oligocene | Culebra Formation | Panama | | An Ocotea species Moved from Mespilodaphne columbiana (1924) | |
| Ocotea eolignitica | Comb nov | | (Hollick) LaMotte | Eocene | | USA Louisiana | | An Ocotea species Moved from Mespilodaphne eolignitica (1916) First named Andromeda eolignitica (1899) | |
| Ocotea hispanioiana | Comb nov | | (Berry) LaMotte | Miocene | Arbitonite Group | Haiti | | An Ocotea species Moved from Mespilodaphne hispanioiana (1922) | |
| Ocotea inequilateralis | Comb nov | | (Berry) LaMotte | Eocene | Gosport Formation | USA Alabama | | An Ocotea species Moved from Mespilodaphne inequilateralis (1924) | |
| Ocotea intermedia | Comb nov | | (Berry) LaMotte | Eocene | Holly Springs Formation | USA Tennessee | | An Ocotea species Moved from Mespilodaphne intermedia (1930) | |
| Ocotea lancifolia | Comb nov | | (Lesquereux) LaMotte | Eocene Ypresian | Holly Springs Formation | USA Tennessee | Oreodaphne knowltoni (1929) | An Ocotea species Moved from Oreodaphne lancifolia (1934) First described as Sapindus lancifolius (1883) | |
| Ocotea lithaeformis | Comb nov | | (Lesquereux) LaMotte | | | USA California | Oreodaphne heerii (1888) | An Ocotea species Moved from Mespilodaphne lithaeformis (1888) | |
| Ocotea mississippiensis | Comb nov | | (Berry) LaMotte | Eocene | Holly Springs Formation | USA Mississippi | Laurus primigenia (of Hollick) | An Ocotea species Moved from Mespilodaphne lithaeformis (1916) | |
| Ocotea obtusifolia | Comb nov | | (Berry) LaMotte | Eocene | Holly Springs Formation | USA Mississippi | Cinnamomum sezannense (of Hollick 1899) | An Ocotea species Moved from Oreodaphne obtusifolia (1916) | |
| Ocotea pagosensis | Comb nov | | (Hollick) LaMotte | Paleocene | Animas Formation | USA Colorado | | An Ocotea species Moved from Oreodaphne pagosensis (1924) | |
| Ocotea palomarensis | Comb nov | | (Berry) LaMotte | Miocene | | Mexico Oaxaca | | An Ocotea species Moved from Mespilodaphne obtusifolia (1923) | |
| Ocotea perseaformis | Comb nov | | (Ball) LaMotte | Eocene | Indio Formation | USA Texas | | An Ocotea species Moved from Oreodaphne perseaformis (1939) | |
| Ocotea praefracta | Comb nov | | (Ball) LaMotte | Eocene | Wilcox Formation | USA Texas | | An Ocotea species Moved from Oreodaphne praefracta (1939) | |
| Ocotea precoushatta | Comb nov | | (Berry) LaMotte | Eocene | Indio Formation | USA Texas | | An Ocotea species Moved from Mespilodaphne perseaformis (1924) | |
| Ocotea pseudoglauca | Comb nov | | (Berry) LaMotte | Eocene | Wilcox Formation | USA Louisiana | synonymy Laurus californica pro part (1888) Laurus socialis pro part (1888) | An Ocotea species Moved from Mespilodaphne pseudoglauca (1916) | |
| Ocotea pseudoguianensis | Comb nov | | (Berry) LaMotte | Eocene | Wilcox Formation | USA Louisiana | | An Ocotea species Moved from Mespilodaphne pseudoguianensis (1916) | |
| Ocotea puryearensis | Comb nov | | (Berry) LaMotte | Eocene | Ackerman Formation | USA Mississippi | | An Ocotea species Moved from Oreodaphne pseudoguianensis (1916) | |
| Ocotea (?) ratonensis | Comb nov | | (Hollick) LaMotte | Paleocene | Raton Formation | USA Colorado | | An Ocotea species Moved from Oreodaphne (?) ratonensis (1917) | |
| Ocotea ripariafolia | Comb nov | | (Berry) LaMotte | Miocene | Forest Clay Formation | Trinidad and Tobago Trinidad | | An Ocotea species Moved from Aniba ripariafolia (1937) | |
| Ocotea salinensis | Comb nov | | (Berry) LaMotte | Eocene | Wilcox Formation | USA Arkansas | | An Ocotea species Moved from Oreodaphne salinensis (1916) | |
| Ocotea tertiaria | Comb nov | | (Berry) LaMotte | | | Costa Rica | | An Ocotea species Moved from Goeppertia tertiaria (1921) | |
| Ocotea texana (Berry) | Comb nov | Homonym | (Berry) LaMotte | Eocene | Fayette Formation | USA Texas | | An Ocotea species Moved from Mespilodaphne texana (1924) Homonym with Ocotea texana (Ball) | |
| Ocotea texana (Ball) | Comb nov | Homonym | (Ball) LaMotte | Eocene | Indio Formation | USA Texas | | An Ocotea species Moved from Oreodaphne texana (1931) Homonym with Ocotea texana (Berry) | |
| Ocotea viridiflumensis | Comb nov | | (Knowlton) LaMotte | Eocene | Green River Formation | USA Colorado | | An Ocotea species Moved from Oreodaphne coloradensis (1923) | |
| Ocotea wilcoxensis | Comb nov | | (Berry) LaMotte | Eocene | Wilcox Formation | USA Tennessee | | An Ocotea species Moved from Oreodaphne wilcoxensis (1916) | |
| Sassafras quilchenensis | Sp nom nov | | LaMotte | Eocene Ypresian | Eocene Okanagan Highlands Coldwater Beds | Canada British Columbia | | A Sassafras species A new name for Sassafras cretaceum (Penhallow) (1906) | |
| Umbellularia saliciformis | Comb nov | | (Knowlton & Cockerell) LaMotte | Miocene | Neroly Formation | USA California | synonymy Laurus similis (of Berry 1929) Leguminosites bonseri (1929) Quercus simulata (of Berry 1929) Umbellularia dayana (1937) Umbellularia oregonensis (1930) Umbellularia salicifolia (1939) | 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) | |

### Monocots

| Name | Novelty | Status | Authors | Age | Unit | Location | Notes |
| Cyperacites islandicus | Comb nov | | (Heer) LaMotte | Paleocene | | Iceland | 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 | USA Washington | A possible pond weed species New name for referred "Potamogeton heterophylloides" fossils P. heterophylloides type specimens moved to Keteleeria heterophylloides (1940) |

### Basal eudicots

| Name | Novelty | Status | Authors | Age | Unit | Location | Synonymized taxa | Notes | Images |
| Nelumbium crossii | Comb nov | | (Knowlton) LaMotte | Paleocene | Arapahoe Formation | USA Colorado | | A lotus relative. Moved from Nelumbo crossii (1930) | |
| Nelumbium protolutea | Comb nov | | (Berry) LaMotte | Eocene | Wilcox Formation | USA Mississippi | Nelumbo tenuifolia (of Berry, 1935) | A lotus relative. Moved from (1949) Nelumbites protoluteus First named Nelumbo protolutea (1917) | |

### Core Eudicots
#### Superasterids

| Name | Novelty | Authors | Age | Unit | Location | Synonymized taxa | Notes |
| Achras agnitionalis | Comb nov | (Hollick) LaMotte | Miocene | Collazo Shale | USA Puerto Rico | | A Manilkara species. Moved from Sapota agnitionalis (1928) |
| Arbutus xalapoldes | Sp nom nov | LaMotte | Pliocene | | USA California | | 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 | USA Tennessee | | A marlberry species. Moved from Icacorea prepaniculata (1916) |
| Ardisia prisca | Comb nov | (Hollick) LaMotte | Miocene | Collazo Shale | USA Puerto Rico | | A marlberry species. Moved from Icacorea prisca (1924) |
| Asclepias fructifer | Comb nov | (Cockerell) LaMotte | Eocene Priabonian | Florissant Formation | USA Colorado | | A milkweed species. Moved from Acerates fructifer (1908) |
| Asclepias veterana | Comb nov | (Heer) LaMotte | Miocene | | Switzerland | | A milkweed species. Moved from Acerates veterana (1859) |
| Asclepias wilcoxiana | Comb nov | (Berry) LaMotte | Eocene | Wilcox Formation | USA Tennessee | | A milkweed species. Moved from Acerates wilcoxiana (1930) |
| Coccoloba chapini | Comb nov | (Hollick) LaMotte | Paleocene/Eocene | Matanuska coal field | USA Alaska | | A Coccoloba species. Moved from Coccolobis chapini (1936) |
| Coccoloba claibornensis | Comb nov | (Berry) LaMotte | Eocene | Gosport Formation | USA Alabama | | A Coccoloba species. Moved from Coccolobis claibornensis (1924) |
| Coccoloba columbianus | Comb nov | (Berry) LaMotte | Eocene | Yegua Formation | USA Louisiana | | A Coccoloba species. Moved from Coccolobis columbianus (1924) |
| Coccoloba eolignitica | Comb nov | (Berry) LaMotte | Eocene | Lagrange Formation | USA Tennessee | | A Coccoloba species. Moved from Coccolobis columbianus (1916) |
| Coccoloba uviferafolia | Comb nov | (Berry) LaMotte | Eocene | Lagrange Formation | USA Tennessee | | A Coccoloba species. Moved from Coccolobis uviferafolia (1916) |
| Cryptantha auriculata | Comb nov | (Elias) LaMotte | Pliocene | Ogallala Formation | USA Kansas | | A Cryptantha species. Moved from Krynitikia auriculata (1932) |
| Cryptantha chaneyi | Comb nov | (Elias) LaMotte | Pliocene | Ogallala Formation | USA Kansas | | A Cryptantha species. Moved from Krynitzkia (Oreocarya) chaneyi (1932) |
| Cryptantha coroniformis | Comb nov | (Elias) LaMotte | Pliocene | Ogallala Formation | USA Kansas | | A Cryptantha species. Moved from Krynitzkia (Oreocarya) coroniformis (1932) |
| Gonolobus (?) trinervatus | Comb nov | (MacGinitie) LaMotte | Miocene | Trout Creek Flora | USA Oregon | | An asclepiadoid milkweed family species Moved from Vincetoxicum (?) trinervata (1933) |
| Halesia inopinum | Comb nov | (Hollick) LaMotte | Paleocene | Berg lake Formation | USA Alaska | | A snowdrop tree species Moved from Mohrodendron inopinum (1936) |
| Leiophyllum pleistocenicum | Comb nov | (Berry) LaMotte | Pleistocene | | USA North Carolina | | A sandmyrtle species First described as Dendrium pleistocenicum (1907) |
| Viburnum comstocki | Comb nov | (Sanborn) LaMotte | Eocene | | USA Oregon | synonymy Aralia taurinensis (pro part of Sanborn 1935) Diospyros orientalis (1935) Viburnum variabilis (1941) | A Viburnum species First described as Mallotus comstocki (1935) |

#### Superrosids

| Name | Novelty | Status | Authors | Age | Unit | Location | Synonymized taxa | Notes | Images |
| Acer (Negundo) decurrens | Comb nov | | (Lesquereux) LaMotte | Paleocene | Denver Formation | USA Colorado | | A maple. Moved from Negundo decurrens (1888) | |
| Acer (Negundo) fremontensis | Comb nov | | (Berry) LaMotte | Eocene | Bridger Formation | USA Wyoming | | A maple. Moved from Negundo fremontensis (1930) | |
| Acer negundifolium | Comb nov | | (Dawson) LaMotte | Eocene (Ypresian) | Eocene Okanagan Highlands Stump lake | Canada British Columbia | | A possible maple. Moved from Acerites negundifolium (1891) | |
| Acer orbum | Sp nom nov | | LaMotte | Eocene | Ione Formation | USA California | | 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 | USA North Dakota | | A maple. Moved from Negundo triloba (1868) | |
| Acer tuckeri | Comb nov | | (Smith) LaMotte | Pliocene | "Hog Creek" | USA Idaho | | A maple. Moved from Engdhardtia tuckeri (1938) | |
| Canarium leonis | Comb nov | | (Cockerell) LaMotte | Eocene | Ione Formation | USA California | synonymy Juglans californica (1878) Canarium californicum (1941) | A Canarium species. Moved from Juglans leonis (1908) | |
| Carya bartoni | Comb nov | | (Ball) LaMotte | Eocene | | USA Texas | | A hicory species. Moved from Hicoria bartoni (1931) | |
| Carya biacuminata | Comb nov | | (Perkins) LaMotte | Eocene | Brandon lignites | USA Vermont | | A hicory species. Moved from Hicoria biacuminata (1904) | |
| Carya crescentia | Comb nov | | (Knowlton) LaMotte | Paleocene | | USA Wyoming | | A hickory species. Moved from Hicoria crescentia (1899) | |
| Carya culveri | Comb nov | | (Knowlton) LaMotte | Paleocene | | USA Wyoming | | A hickory species. Moved from Hicoria culveri (1899) | |
| Carya dawsoni | Comb nov | valid | (Berry) LaMotte | Early Eocene (Ypresian) | Okanagan Highlands Chu Chua Formation | Canada British Columbia | | A hickory. Moved from Hicoria dawsoni (1962) | |
| Carya dentata | Comb nov | | (Knowlton) LaMotte | Paleocene | | USA Wyoming | | A hickory species. Moved from Hicoria culveri (1899) | |
| Carya jacksoniana | Comb nov | | (Berry) LaMotte | Eocene | Yegua Formation | USA Texas | synonymy Carya olivaeformis (1859) Hicoria pecan (1915) | A hickory species. Moved from Hicoria jacksoniana (1924) | |
| Carya juxtaporipites | Comb nov | | (Berry) LaMotte | Eocene Ypresian | Green River Formation | USA Colorado | | A hickory species. Moved from Hicoria juxtaporipites (1933) | |
| Carya (?) oregoniana | Comb nov | | (Knowlton) LaMotte | Eocene | Clarno Formation | USA Oregon | | A hickory species. Moved from Hicoria (?) oregoniana (1902) | |
| Carya orientalis | Comb nov | | (Chaney) LaMotte | Oligocene | Eagle Creek flora | USA Oregon | | A hickory species. Moved from Hicoria orientalis (1920) | |
| Carya pretexana | Comb nov | | (Berry) LaMotte | Pliocene | Citronelle Formation | USA Alabama | | A hickory species. Moved from Hicoria pretexana (1916) | |
| Carya princetoniana | Comb nov | | (Cockerell) LaMotte | Eocene Priabonian | Florissant Formation | USA Colorado | | A hickory species. Moved from Hicoria princetoniana (1908) | |
| Carya rostrataformis | Comb nov | | (Berry) LaMotte | Eocene | Lagrange Formation | USA Tennessee | | A hickory species. Moved from Hicoria rostrataformis (1924) | |
| Carya stanleyanum | Comb nov | valid | (Dawson) LaMotte | Early Eocene (Ypresian) | Huntingdon Formation | Canada British Columbia | | A hickory. Moved from Hicoria dawsoni (1962) First named Dryophyllum stanleyanum (1895) | |
| Carya williamsi | Comb nov | | (Chaney) LaMotte | Oligocene | Eagle Creek flora | USA Oregon | | A hickory species. Moved from Hicoria williamsi (1920) | |
| Celtis americana | Comb nov | | (Berry) LaMotte | Eocene | McBean Formation | USA Georgia | Mimosa americana (1919) | A Celtis species. Moved from Momisia americana (1914) | |
| Cercidiphyllum piperoides | Comb nov | | (Lesquereux) LaMotte | Eocene | Ione Formation | USA California | synonymy Ceanothus idahoensis (1935) Cercidiphyllum elongatum (1939) Populus smilacifolia (1920) Populus zaddachi (1878) Trochodendroides zaddacki (1935) Zizyphus californica (1919) Zizyphus microphyUus (Lesquereux) (1878) | A katsura species. Moved from Zizyphus piperoides (1878) Moved to Tetracentron piperoides in 1977 | Tetracentron piperoides |
| Comptonia parvula | Comb nov | | (Heer) LaMotte | Cretaceous | Patoot beds | Denmark Greenland | synonymy Myrica (Comptonia) parvifolia (1883) Comptonia microphylla (1906) | A Comptonia species. Moved from Myrica (Comptonia) parvula (1916) | |
| Cupanites berryi | Sp nom nov | | LaMotte | Eocene | Barnwell Formation | USA Georgia | | A sapindaceous Cupanites species. A new name for Cupanites nigricans (1918) | |
| Inga alia | Sp nom nov | | LaMotte | Miocene | | Cuba | | 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 | USA Kentucky | | A sweetgum species A replacement name for Liquidambar incerta (Berry, 1924) (1924) | |
| Macrolobium geminifolia | Comb nov | | (MacGinitie) LaMotte | Eocene | Ione Formation | USA California | | A Macrolobium species legume. Moved from Vouapa geminifolia (1941) | |
| Melastomites incertus | Sp nom nov | | LaMotte | Oligocene | Culebra Formation | Panama | | A melastome species A replacement name for Melastomites miconioides (Berry, 1919) (1919) | |
| Populus americana | Comb nov | | (Lesquereux) LaMotte | Eocene Priabonian | Florissant Formation | USA Colorado | synonymy Populus heerii (of Lesquereux 1883) Populus lesquereuxi (1906) | A cottonwood species. Moved from Pterocarya americana (1874) | |
| Populus (?) paramonodon | Sp nom nov | | LaMotte | Paleocene | | USA New Mexico | | 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 | USA Colorado | Quercus neriifolia (of Lesquereux, 1883 | 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 | USA Tennessee | | A possible cherry species Moved from Amygdalus wilcoxiana (1930) | |
| Pyrus alvordensis | Comb nov | | (MacGinitie) LaMotte | | Trout Creek flora | USA Oregon | | A possible mountain ash species Moved from Sorbus alvordensis (1933) | |
| Pyrus coronariafolia | Comb nov | | (Berry) LaMotte | Pleistocene | | USA North Carolina | | A possible apple species Moved from Malus coronariafolia (1907) | |
| Pyrus decorafolia | Comb nov | | (Berry) LaMotte | Eocene (Ypresian) | Okanagan Highlands Chu Chua Formation | Canada British Columbia | | A possible mountain ash species Moved from Sorbus decorafolia (1926) | |
| Pyrus diversifolia (Lesquereux) | Comb nov | Jr homonym | (Lesquereux) LaMotte | Eocene (Priabonian) | Florissant Formation | USA Colorado | synonymy Crataegus acerifolia (Lesquereux) (1883) Crataegus lesquereuxi (1906) Onoclea reducta (1908) | 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 | | Denmark Greenland | | A possible mountain ash species Moved from Sorbus grandifolia (1869) | |
| Pyrus harneyensis | Comb nov | | (Axelrod) LaMotte | Pliocene | | USA Oregon | | A possible mountain ash species Moved from Sorbus harneyensis (1944) | |
| Pyrus idahoensis | Comb nov | | (Brown) LaMotte | Oligocene | Salmon flora | USA Idaho | | A possible apple species Moved from Malus idahoensis (1935) | |
| Pyrus megaphylla | Comb nov | | (Cockerell) LaMotte | Eocene Priabonian | Florissant Formation | USA Colorado | | A possible mountain ash species Moved from Sorbus megaphylla (1908) | |
| Pyrus nupta | Comb nov | | (Cockerell) LaMotte | Eocene Priabonian | Florissant Formation | USA Colorado | Myrica diversifolia (1883) pro part | A possible mountain ash species Moved from Sorbus nupta (1910) | |
| Pyrus pseudoangustifolla | Comb nov | | (Berry) LaMotte | Pliestocene | | USA North Carolina | | A possible apple species Moved from Malus pseudoangustifolla (1910) | |
| Shepherdia weaveri | Comb nov | | (Hollick) LaMotte | Paleocene - Eocene | "Kachemak Bay flora" | USA Alaska | | A possible buffaloberry species Moved from Lepargyraea weaveri (1936) | |
| Sphaeralcea (?) exhumatum | Comb nov | | (Cockerell) LaMotte | Eocene Priabonian | Florissant Formation | USA Colorado | | A possible globemallow species Moved from Malvastrum (?) exhumatum (1906) | |
| Ulmus chuchuanus | Sp nom nov | valid | (Berry) LaMotte | Eocene (Ypresian) | Okanagan Highlands Chu Chua Formation | Canada British Columbia | | An elm. New name for "Ulmus columbianus" Berry (1926) Junior homonym of "Ulmus columbiana" Penhallow (1907) | Ulmus chuchuanus |
| Xanthoxylum alia | Sp nom nov | | LaMotte | Miocene | | Cuba | | 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 | USA Florida | | A possible Zanthoxylum species Moved from Fagara apalachacolensis (1916) | |
| Xanthoxylum catahoulensis | Comb nov | | (Berry) LaMotte | Eocene | Catahoula Formation | USA Louisiana | | 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 | USA Texas | | A possible Zanthoxylum species Moved from Fagara claibornensis (1924) | |
| Xanthoxyium (?) delicatula | Comb nov | | (Cockerell) LaMotte | Eocene Priabonian | Florissant Formation | USA Colorado | | A possible Zanthoxylum species Moved from Fagara (?) delicatula (1908) | |
| Xanthoxylum dubium | Comb nov | nomen nudum | (Lesquereux) LaMotte | Paleocene | Raton Formation | USA New Mexico | | A possible Zanthoxylum species Moved from Zanthoxylum dubium (1872) Considered nomen nudum by LaMotte | |
| Xanthoxylum eocenica | Comb nov | | (Berry) LaMotte | Eocene | Lagrange Formation | USA Tennessee | | A possible Zanthoxylum species Moved from Fagara eocenica (1916) | |
| Xanthoxylum juglandianum | Comb nov | | (Braun) LaMotte | "Tertiary" | | Europe | | A possible Zanthoxylum species Moved from Zanthoxylum juglandianum (1878) | |
| Xanthoxylum miocenica | Comb nov | | (Berry) LaMotte | Miocene | Forest Sand Formation | Trinidad | | A possible Zanthoxylum species Moved from Fagara miocenica (1925) | |
| Xanthroxylum petraflumensis | Comb nov | | (Berry) LaMotte | Eocene | Yegua Formation | USA Texas | | A possible Zanthoxylum species Moved from Fagara petraflumensis (1924) | |
| Xanthoxylum puryearensis | Comb nov | | (Berry) LaMotte | Eocene | Lagrange Formation | USA Tennessee | | A possible Zanthoxylum species Moved from Fagara eocenica (1916) | |
| Xanthoxyium spireaefolia | Comb nov | | (Lesquereux) LaMotte | Eocene Priabonian | Florissant Formation | USA Colorado | | A possible Zanthoxylum species Moved from Fagara spireaefolia (1908) First named Zanthoxylum spireaefolium (1883) | |
| Xanthoxylum wadii | Comb nov | | (Berry) LaMotte | Miocene | | Mexico Oaxaca | | A possible Zanthoxylum species Moved from Fagara wadii (1923) | |
| Xanthoxylum wyomingensis | Comb nov | | (Berry) LaMotte | Eocene | Bridger Formation | USA Wyoming | | A possible Zanthoxylum species Moved from Fagara wyomingensis (1930) | |

### Other angiosperms

| Name | Novelty | Status | Authors | Age | Unit | Location | Synonymized taxa | Notes | Images |
| Carpites interglacialis | Comb nov | | (Hollick) LaMotte | Miocene | St. Eugene Silts | Canada British Columbia | synonymy Carpites menthoides (1926) Carpolithes sp. (1937) Equisetum sp. (underground stem) (1926) Malva (?) hesperia (1928) Phyllites amplexicaulis (1926) | A fruit/seed species of uncertain affinity. Moved from Ficus interglacalis (1928) | |

## General research

* Robert LaMotte publishes the Catalogue of the Cenozoic plants of North America through 1950, with numerous nomenclatural updates and corrections.