Transberingial Distribution of Platimeliphyllum (Platanaceae) in the Eocene of eastern Asia and western North America

2021 ◽  
Author(s):  
Indah B. Huegele ◽  
Hai Zhu ◽  
Bailong Zhao ◽  
Yu-Fei Wang ◽  
Steven R. Manchester
Keyword(s):  
North America ◽  
Western North America ◽  
Eastern Asia

The Galium trifidum group (Galium sect. Aparinoides, Rubiaceae)

1976 ◽  
Vol 54 (16) ◽  
pp. 1911-1925 ◽  
Author(s):  
C. Puff
Keyword(s):  
North America ◽  
Eastern North America ◽  
Great Lakes Region ◽  
Western North America ◽  
Eastern Asia ◽  
Chromosome Counts ◽  
New Classification ◽  
North Eastern ◽  
North Western

By using morphology, karyology, pollen size, leaf flavonoids, ecological observations, and modification experiments, a new classification of the Galium trifidum group is proposed. Nine taxa in five species are recognized: (1) G. tinctorium, with ssp. tinctorium and sap. floridanum (new comb.) in eastern North America; (2) G. brevipes, a rare species centered in the Great Lakes region; (3) G. trifidum, with ssp. trifidum in northern North America. Asia, and Europe, ssp. columbianum (new comb.) in (north)western North America and (north)eastern Asia, and ssp. subbiflorum (new comb.) and ssp. halophilum (new comb.) in northern North America; (4) G. innocuum in southeastern Asia; (5) G. karakulense in central Asia.New chromosome counts of n = 12 and 2n = 24 are reported for G. tinctorium ssp. tinctorium and ssp. floridanum; and G. trifidum ssp. trifidum, ssp. columbianum, and ssp. subbiflorum.

First lambeosaurine hadrosaurid from Europe: palaeobiogeographical implications

1999 ◽  
Vol 136 (2) ◽  
pp. 205-211 ◽  
Author(s):  
M. L. CASANOVAS ◽  
X. PEREDA SUBERBIOLA ◽  
J. V. SANTAFE ◽  
D. B. WEISHAMPEL
Keyword(s):  
North America ◽  
Iberian Peninsula ◽  
First Record ◽  
Western North America ◽  
Eastern Asia ◽  
Postcranial Remains ◽  
New Material ◽  
Cretaceous Period ◽  
Primitive Member

New dinosaur specimens from the uppermost Cretaceous of Spain represent the first record of a lambeosaurine hadrosaurid from Europe. This discovery, which consists of skull, mandible, and postcranial remains from the Tremp Basin (Lleida Province, Catalonia), is particularly unexpected because lambeosaurines are otherwise well known from western North America and central and eastern Asia. Originally named Pararhabdodon isonensis, a species previously regarded as a basal iguanodontian dinosaur, new material indicates that Pararhabdodon is in fact a primitive member of the lambeosaurine clade. The presence of lambeosaurines on the Iberian Peninsula at the very end of the Cretaceous period is likely due to vicariance rather than dispersal. The distribution of hadrosaurids suggests biogeographic differences across the European archipelago at the end of the Cretaceous.

Biogeographic relationships between the macrofungi of temperate eastern Asia and eastern North America

1997 ◽  
Vol 75 (12) ◽  
pp. 2108-2116 ◽  
Author(s):  
Qiuxin Wu ◽  
Gregory M. Mueller
Keyword(s):  
North America ◽  
Key Words ◽  
North American ◽  
Field Work ◽  
Disjunct Distribution ◽  
Eastern North America ◽  
Western North America ◽  
Eastern Asia ◽  
Key Words Biogeography

Eastern North America and temperate eastern Asia reportedly share a relatively high number of taxa of macrofungi (mushrooms and relatives), including a number of taxa that have putative eastern North America – temperate eastern Asia disjunct distributions. These reports have been used to imply an affinity between the mycota (fungal equivalent of flora and fauna) of the two regions. To date, however, this affinity has not been examined in detail. A comparison of north temperate macrofungal mycotas was undertaken to examine the similarity between these regions. We used two methods in this study: (i) direct comparison of taxon lists and (ii) calculation of the Simpson Coefficient of similarity from lists of selected taxa. These analyses were based on field work, herbarium records, and published taxonomic treatments for Amanita, Lactarius, Ramaria, and Boletaceae. Results of these analyses document that taxonomic similarity between eastern North America and temperate eastern Asia mycotas can be quite high. In all cases, the calculated similarity values for eastern North America – temperate eastern Asia comparisons are higher than those between either region of North America and Europe or between western North America and eastern Asia. Furthermore, the eastern North American and temperate eastern Asian disjunct distributions of macrofungi are usually limited to the level of species or lower. Key words: biogeography, China, disjunct distribution, macrofungi, North America, Simpson Coefficient.

A chromatographic and cytological study of Dryopteris dilatata in North America and eastern Asia

1971 ◽  
Vol 49 (2) ◽  
pp. 247-258 ◽  
Author(s):  
Carl-Johan Widén ◽  
Donald M. Britton
Keyword(s):  
North America ◽  
Chromatographic Analysis ◽  
Cytological Study ◽  
Eastern North America ◽  
Western North America ◽  
European Studies ◽  
Eastern Asia ◽  
Phloroglucinol Derivatives ◽  
Derivatives Of

A chromatographic analysis of the phloroglucinol derivatives of 123 collections of Dryopteris intermedia Gray (2x), D. assimilis S. Walker (2x) from western North America, D. "dilatata" from eastern North America (2x), D. "austriaca" from Japan and Kamchatka, "Aspidium dilatatum" from Siberia, D. campyloptera Clarkson (4x) from eastern North America, D. spinulosa Watt (4x) from North America, the hybrids D. "dilatata" × campyloptera (3x) and D. intermedia × spinulosa (3x) is presented. D. "dilatata" from eastern North America has an extremely variable phloroglucinol content, which limits the utility of the analysis for taxonomy. The chromatographic and cytological results are discussed in connection with the evolution of the two tetraploid taxa, D. campyloptera and D. spinulosa. The intra-specific variability of each taxon is discussed and compared with the extensive European studies. The material investigated may be considered to belong to the following species: D. intermedia Gray (2x), D. assimilis S. Walker (2x), D. campyloptera Clarkson (4x), and D. spinulosa Watt (4x). Only two different ancestral genomes are considered to be present in these four species, one in the first three species, and two in D. spinulosa.

scholarly journals Variability in Sorbitol : Sucrose Ratio in Mature Leaves of Different Prunus Species

1997 ◽  
Vol 122 (1) ◽  
pp. 83-90 ◽  
Author(s):  
Annick Moing ◽  
Nathalie Langlois ◽  
Laurence Svanella ◽  
Anne Zanetto ◽  
Jean-Pierre Gaudillère
Keyword(s):  
North America ◽  
High Performance ◽  
Geographical Origin ◽  
Soluble Sugars ◽  
Eastern North America ◽  
Western North America ◽  
Eastern Asia ◽  
Prunus Species ◽  
Mature Leaves ◽  
Western Asia

Sorbitol is a sugar alcohol, present with sucrose in Rosaceae trees, which seems to have a role in plant response to environmental stress. The aim of this study was to investigate variability in sorbitol : sucrose ratio in source leaves of 53 species or hybrids of Prunus. The studied taxa, representing three subgenera and 11 sections of the Prunus genus, were chosen from the Prunus collection at the Institut National de la Recherche Agronomique, Bordeaux, France. Young mature leaves were sampled on three dates in spring and summer and were analyzed for neutral soluble sugars using high-performance liquid chromatography. There were differences in sorbitol : sucrose ratio according to sampling date and according to taxon. Sorbitol content increased and sucrose content decreased from May to July, leading to an increase in sorbitol : sucrose ratio. For each date, there was a high variability within botanical sections for sorbitol : sucrose ratio. The highest variability between species for sorbitol : sucrose ratio was in July, with P. cocomilia having the lowest ratio (1.15, w/w) and P. fremontii having the highest ratio (5.59, w/w). When species were pooled according to their geographical zone of origin, species originating from Japan showed the lowest sorbitol : sucrose ratio for all sampling dates. In July, species originating from Japan, Europe, and central to western North America had sorbitol : sucrose ratio significantly lower than that of species originating from Europe to western Asia, China to eastern Asia, and central to eastern North America. These results indicate that variability in sorbitol : sucrose ratio exists in the Prunus germplasm and seems to be related to the geographical origin of the species. Moreover, variability in sorbitol to sucrose ratio is high in the germplasm of different Prunus taxa.

A new genus of Lumbriculidae (Oligochaeta) from Korea

1994 ◽  
Vol 72 (11) ◽  
pp. 1960-1966 ◽  
Author(s):  
R. O. Brinkhurst ◽  
P. Rodriguez ◽  
Chon Tae-Soo ◽  
Kwon Tae-Sung
Keyword(s):  
North America ◽  
New Genus ◽  
Vas Deferens ◽  
Western North America ◽  
Eastern Asia ◽  
The Family

Lamprortus orientalis Rodriguez gen.nov., sp.nov. is identifiable as a member of the Lumbriculidae by virtue of the prosoporous male ducts, but is unique in the family, as it is consistently hologynous. The elongate atria, single vas deferens on each atrium, and spermathecae located in the post-ovarian segment indicate a relationship to Lamprodrilus and related genera distributed from Siberia through eastern Asia to western North America.

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