Results 221 to 230 of about 20,537 (257)

Pollinators, herbivores, and the evolution of floral traits

Science, 2019
Floral characters reflect plant adaptation to both bumble bees and leaf-eating ...
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Floral structure and evolution in the Anacardiaceae

Botanical Journal of the Linnean Society, 1991
WANNAN, B. S. & QUINN, C. J, 1991. Floral structure and evolution in the Anacardiaceae. Carpel morphology and anatomy is investigated in 17 genera and carpellode morphology in 12 genera. There is an evolutionary sequence in the family from poorly differentiated, nearly apocarpous gynoecia towards syncarpous gynoecia with clearly defined stigmata ...
BRUCE S. WANNAN, CHRISTOPHER J. QUINN
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The evolution of floral homeotic gene function

BioEssays, 2003
AbstractPlant MADS‐box genes encode transcriptional regulators that are critical for a number of developmental processes. In the angiosperms (the flowering plants), these include the specification of floral organ identities, flowering time and fruit development.
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Floral morphology and evolution in Anisophylleaceae

Botanical Journal of the Linnean Society, 1988
TOBE, H. & RAVEN, P. H., 1988. Floral morphology and evolution in Anisophylleaceae. The four genera of Anisophylleaceae (Anisophyllea, Combretocarpus, Poga, and Polygonanthus) are very uniform in their floral structures. Characteristic floral features of the family are: flowers small (except for the female flowers of Polygonanthus), merism nearly fixed
HIROSHI TOBE, PETER H. RAVEN
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The evolution and maintenance of floral rewardlessness

2016
AbstractThis chapter examines the evolutionary factors behind the losses and gains of floral rewards. While mimicry is associated with plant lineages that lack floral rewards, rewardlessness and mimicry are not synonymous. Pollination typically takes the form of a biological transaction, whereby plants offer a material reward in exchange for a sexual ...
Steven D. Johnson, Florian P. Schiestl
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Evolution of floral nectary in Lamiaceae

Proceedings / Indian Academy of Sciences, 1986
The morphology and vasculature of the floral disc have been studied in 30 species of Lamiaceae to discuss its phylogeny. In Lamiaceae the disc receives vascular supply mostly from the gynoecial bundles which indicates its association with the gynoecium.
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Directional trend of floral evolution

Acta Biotheoretica, 1968
A directional trend of floral evolution, due to the selective activity of pollinating insects, birds and bats, is here described and discussed. Six clearly distinguishable levels in the evolution of flower types are correlated with six corresponding stages of sensory development of pollinating insects (Figs. 1, 2). This sequence of floral evolution was
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Floral structure and evolution in Ranunculanae

1995
Apomorphic tendencies of unusual features shared by two or more families of the Ranunculanae are: early caducous sepals, congenitally closed gynoecium up to the level of the stigma (but still apically gaping after ovule initiation!), protruding diffuse placentae, transverse fruit dehiscence (in Berberidaceae and Papaveraceae); excessive number of tepal
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FLORAL EVOLUTION IN THE HAMAMELIDIDAE. II. INTERPRETATIVE FLORAL MORPHOLOGY OF THE AMENTIFERAE

Acta Botanica Neerlandica, 1975
SUMMARY In this second paper of the series, the floral morphology of apetalous orders most probably to be included in the Hamamelididae, and historically referred to by the name of “Amentiferae”, is discussed. Various traits can be discerned, such as the advent of filaments (not found, or only present in statu nascendi, in Juglandaceae, Balanops ...
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Ecological genetics of floral evolution

2006
Abstract The diversity of floral forms in nature can be explained largely as adaptations to the diversity of biotic and abiotic selective agents with which different plant species interact. Ecological genetics is the study of the process of adaptation, and therefore is an ideal approach to understanding floral adaptations.
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