Results 71 to 80 of about 5,190 (203)

Expelled by the Antarctic ice: Evolutionary history of the tribe Cunonieae (Cunoniaceae)

open access: yesJournal of Systematics and Evolution, Volume 63, Issue 6, Page 1441-1457, November 2025.
Fossil calibration reveals recent radiations and biogeographical history of the Cunonieae tribe. The most densely sampled phylogeny indicated Antarctica and Patagonia as areas of origin, confirming the reestablishment of Pterophylla and revealing the northward movement of Weinmannia into the tropical Andes.
Francisco Fajardo‐Gutiérrez   +10 more
wiley   +1 more source

Early Paleogene climate at mid latitude in South America: mineralogical and paleobotanical proxies from continental sequences in Golfo San Jorge basin (Patagonia, Argentina) [PDF]

open access: yes, 2009
The Paleocene-Eocene boundary was a period of transient and intense global warming that had a deep effect on middle and high latitude plant groups.
Brea, M.   +3 more
core   +5 more sources

Photosynthetic Heat Tolerance Partially Acclimates to Growth Temperature in Tropical Montane Tree Species

open access: yesPlant, Cell &Environment, Volume 48, Issue 11, Page 7848-7861, November 2025.
ABSTRACT Climate warming increases the risk of harmful leaf temperatures in terrestrial plants, particularly in tropical tree species that have evolved in warm and thermally stable environments. We examined heat tolerance thresholds of photosynthetic light reactions in sun‐exposed leaves of 12 tropical montane tree species with different strategies for
Olivier Jean Leonce Manzi   +13 more
wiley   +1 more source

La familia Podocarpaceae en el estado de Hidalgo, México Family Podocarpaceae in the state of Hidalgo, Mexico

open access: yesRevista Mexicana de Biodiversidad, 2006
Una especie de Podocarpaceae, Podocarpus reiche, se registra para el estado de Hidalgo. Se incluye la descripción del género y la especie, datos de distribución geográfica y hábitat en el estado y se citan los ejemplares de herbario examinados.
Raúl Contreras-Medina   +2 more
doaj  

Estructura y regeneración de bosques de Prumnopitys andina en los Andes del sur de Chile

open access: yesGayana: Botanica, 2020
Prumnopitys andina (lleuque) es una especie de conífera con una distribución restringida en Chile y Argentina. A pesar de su importancia ecológica, los conocimientos sobre la estructura y dinámica de los bosques donde crece P. andina son limitados.
Rodrigo Vargas-Gaete   +5 more
doaj  

Morphology and tructure of the pollen cone and pollen grain of the Araucaria species from Argentina [PDF]

open access: yes, 2008
The pollen cone and the pollen grain of the two Argentinean species of Araucaria are described with LM, SEM and TEM. Primordia of pollen cones are formed in April and May and reach maturity by mid-October in A. angustifolia (Bert.) O.
Caccavari, Marta Alicia   +2 more
core  

A new species of Dammaroxylon Schultze-Motel, D. Natalense sp. nov. from the Cretaceous of Natal, South Africa [PDF]

open access: yes, 1976
Main articleIn the Cretaceous rocks of the M'hlosinga district, Zululand, Natal a new species of the form genus Dammaroxylon Schultze-Motel, D. natalense sp. nov., has been discovered.
Erasmus, T.
core  

Spermatophyta Molecular Clock: Time Drift and Recent Acceleration

open access: yesPlant-Environment Interactions, Volume 6, Issue 5, October 2025.
Exponential increase in the base substitution rate in recent geologic time. ABSTRACT Angiospermae radiation is widely recognized as a mid‐Cretaceous event, but the adaptive radiation of Asarum and Viola as spring ephemerals also occurred during the Quaternary. To better understand the evolution of Angiospermae through geological time, a robust and well‐
Soichi Osozawa
wiley   +1 more source

Las Podocarpáceas de los bosques montanos del noroccidente peruano

open access: yesRevista Peruana de Biología, 2013
Los bosques montanos del noroccidente peruano son formaciones vegetales que presentan una alta diversidad y endemismos. Lamentablemente, en muchos lugares están sujetos a procesos acelerados de deterioro por la deforestación y colonización, aspecto que ...
Edgar E. Vicuña-Miñano
doaj   +1 more source

On tile anatomy of Dadoxylon arberi Seward with some remarks on the phylogenetical tendencies of its tracheid pits [PDF]

open access: yes, 1976
Main articleA well preserved specimen of Dadoxylon arberi Seward has been discovered in the Beaufort Series (Upper Karroo System) of the Empangeni district in Natal, South Africa.
Erasmus, T.
core  

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