Results 11 to 20 of about 1,802 (206)

Cronología reproductora de Ceratozamia mexicana (Cycadales)

Botan‪ical Sciences, 2000
En Cemtozamia mexicana Brongn. el desarrollo de la semilla se cumple en 24 meses desde la iniciación de los óvulos en agosto hasta el desarrollo completo del cuerpo del embrión.
María Ydelia Sánchez-Tinoco, E. Mark Engleman, Andrew P. Vovides   +2 more
doaj   +3 more sources

Phylogenetic reconciliation provides new insights into the evolutionary diversification of the glutamine synthetase gene family in seed plants. [PDF]

FEBS J
Phylogenetic analyses of glutamine synthetase (GS) in seed plants revealed that all three major evolutionary lineages (GS2, GS1a, and GS1b) must have been present in the common ancestor, with GS2 being the first lineage to diverge. Unlike GS1b, GS1a and GS2 are usually single‐copy genes, even though they underwent duplications that resulted in ...
Aledo E, Cañas RA, Cantón FR, Aledo JC.   +3 more
europepmc   +2 more sources

Orden cycadales [PDF]

Caryologia, 2001
ilustraciones, fotografías, mapas Se presenta el tratamiento sistematico de las especies pertenecientes al orden Cycadales que crecen en Colombia. En los capitulos introductorios se presentan la historia taxonémica, la morfologia de los érganos vegetativos y reproductivos, la citologta, la biologta de la polinizacién y la conservacién de estas plantas.
Barbara Meurer-Grimes, Dennis W. Stevenson   +1 more
  +7 more sources

Spermatophyta Molecular Clock: Time Drift and Recent Acceleration. [PDF]

Plant Environ Interact
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‐
Osozawa S.
europepmc   +2 more sources

Unraveling Biogeographic Boundaries Within the Sierra Madre Oriental, México: An Endemicity Analysis Using a Taxonomically Diverse Dataset. [PDF]

Ecol Evol
We provide boundaries of the Sierra Madre Oriental in Mexico through a multi‐taxa endemicity analysis. ABSTRACT The Sierra Madre Oriental (SMO) is a significant mountain range and one of Mexico's 14 biogeographical provinces. Its delimitation has been debated.
Goyenechea Mayer-Goyenechea I, Montiel-Canales G, Márquez J, Hornung-Leoni CT, Castillo-Cerón JM, Manríquez-Morán NL.   +5 more
europepmc   +2 more sources

1039 ZAMIA DECUMBENS: Cycadales, Zamiaceae

Curtis's Botanical Magazine, 2022
SummaryZamia decumbens Calonje, Meerman, M.P.Griff. & Hoese, a threatened cycad species from Belize, is showcased and illustrated based on field observations as well as plants cultivated in the ex situ conservation living collections of Montgomery Botanical Center (MBC) in Coral Gables, Florida.
Natalia Herrera‐Blitman, Michael Calonje, Jan Meerman, Rudy Aguilar, Alan W. Meerow, Javier Francisco‐Ortega, M. Patrick Griffith   +6 more
openaire   +1 more source

La diversificación de las cícadas y la biodiversidad tropical

Collectanea Botanica, 2012
El reciente e inesperado descubrimiento de que las Cycadales actuales no son relictos Jurásico-Cretácicos (200-65 Mya), ya que todos sus géneros iniciaron su diversificación durante el Mioceno Tardío (12 Mya), ha puesto en entredicho un mito evolutivo ...
V. Rull
doaj   +1 more source

Zamia inermis, the more threatened cycad of Mexico [PDF]

, 2017
Zamia inermis (Zamiaceae) es una cícada rara, endémica y actualmente listada en Peligro Crítico de Extinción. De la misma, sólo se conoce una población compuesta de tres subpoblaciones, que se encuentra distribuido en tan sólo 2,5 km2 de pastizales y ...
Iglesias Andreu, Lourdes Georgina, Octavio Aguilar, Pablo, Rivera-Fernández, Andrés, Vovides, Andrés P.   +3 more
core   +2 more sources

Cyrioctea (Araneae, Zodariidae) in Africa: temperate Gondwanaland relict, recent radiation, or both? [PDF]

, 2013
Two new species of the zodariid genus Cyrioctea Simon, 1889 are described: C. sawadee sp. nov. and C. lotzi sp. nov., both only known from males. The genus now contains seven Afrotropical species and this abundance is discussed in the context of its ...
Jocqué, Rudy C.A.M.
core   +2 more sources

Estimating clade‐specific diversification rates and palaeodiversity dynamics from reconstructed phylogenies

Methods in Ecology and Evolution, 2023
Understanding palaeodiversity dynamics through time and space is a central goal of macroevolution. Estimating palaeodiversity dynamics has been historically addressed with fossil data because it directly reflects the past variations of biodiversity ...
Nathan Mazet, Hélène Morlon, Pierre‐Henri Fabre, Fabien L. Condamine   +3 more
doaj   +1 more source