Quercus affinis is a species of plants with 8 observations. Quercus peduncularis is an oak in the white oak group (Quercus sect. Quercus) native to Mexico and Central America, ranging from Jalisco to Honduras. Quercus affinis Mart. & Galeotti. Go To Encyclopedia of Life Family: Fagaceae. [Quercus nitens var. subintegra]. Quercus affinis image. Web Links.


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Data of quercus affinis traits were obtained for ten randomly quercus affinis leaves in each of individuals from 16 populations sampled along a geographical gradient, including the distribution area of both species and a putative area of secondary contact and hybridization.

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A distinct pattern of change across populations was observed for each trait. Variation was particularly pronounced along the geographical gradient for petiole length and leaf-margin teeth number, possibly implying selection on these two traits.

Results suggest that phenotypic plasticity, quercus affinis flow, hybridization and natural selection have shaped foliar variation in this oak complex. Many studies have identified variation in phenotypic characters within plant species as a result of these factors e. The genus Quercus has been an interesting subject for studies of leaf morphology, because it is characterized by considerably high levels of variability.

The high frequency of hybridization in Quercus incorporates further variation to the intrinsic variability within species and may complicate the interpretation of taxonomic patterns Tucker, ; Hardin, ; Aas, ; Rushton, For this reason, considerable efforts have been directed to understand phenotypic differentiation between species within particular complexes Kleinschmit et al.

Quercus affinis Scheidw. — The Plant List

In natural populations, a continuum in leaf morphology has been quercus affinis in areas of range overlap between oak species that are well differentiated outside of the region of sympatry Jensen et al.

These patterns of variation have been interpreted as supporting the view that such areas represent secondary hybrid zones, and imply that extensive hybridization and backcrossing have occurred.

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  • INTRODUCTION

In this study, we analysed patterns of foliar variation in a complex consisting of two species of Mexican quercus affinis oaks, Quercus affinis Scheidw. According to a preliminary phylogenetic analysis based on morphological characters, quercus affinis two species are closely related taxa S.

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The two species have partially overlapping distributions and show morphological intergradation in the area of overlap Valencia, However, outside of this area phenotypic differentiation is clear, and Q.

Other architectural and microanatomical features of the leaves, such as the venation pattern quercus affinis the density of trichomes, also show some degree of differentiation between morphologically representative populations of the two species Valencia, Discriminant quercus affinis analysis has been used previously to characterize foliar differentiation between reference populations of Q.

Foliar variation between the two species was found to be continuous across the gradient, although only a relatively small fraction of the individuals were morphologically intermediate.

Within populations, the morphology of a single species predominated in most cases, that is, the majority of the individuals appeared to be similar to morphologically representative Quercus affinis. The specific questions addressed in this study were: What are the patterns of change of particular foliar traits quercus affinis the Q.

What is the pattern of relationships among populations according to their morphological similarities? How is morphological variation partitioned among quercus affinis hierarchical levels, including species, populations, trees and leaves?

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Are populations situated in the area of overlap morphologically more variable, as is expected for hybrid populations? Finally, we use the quercus affinis to draw some inferences about the possible underlying evolutionary mechanisms that have produced patterns of morphological variation in these oaks.

Oaks of the World

Sixteen populations located throughout the geographical distribution of both species and the area of overlap, and considered to be representative of the range of morphological variation present in the complex i. As shown in Figure 1collection localities were situated in three main mountain ranges in Mexico: Morphologically representative populations of Quercus affinis.

The area quercus affinis morphological intergradation is in the eastern region of the volcanic belt, and morphologically representative populations of Q.



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