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A. J. Richards

Researcher at Newcastle University

Publications -  8
Citations -  402

A. J. Richards is an academic researcher from Newcastle University. The author has contributed to research in topics: Pollen & Nectar. The author has an hindex of 7, co-authored 8 publications receiving 376 citations.

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The origin of Taraxacum agamospecies

TL;DR: The genus Taraxacum is thought that the genus arose in the west Himalayas during the Cretaceous and that apomixis arose at an early stage by means of polyploidy, precocious embryony and asynapsis in the female meiosis.
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Studies in Garcinia, dioecious tropical forest trees: the origin of the mangosteen (G. mangostana L.)

TL;DR: It is suggested that mangosteen is an allopolypoid derivative of these species which arose as a female from a single hybridization event in cultivation, and which has since reproduced asexually.
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Studies in Garcinia, dioecious tropical forest trees : agamospermy

TL;DR: It is considered that facultative agamospermy renders the genus Garcinia particularly suitable for the development of new types of fruit, as well as unusual phenomena, which are discussed in the context of the lifestyle of a tropical forest tree.
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Studies in Garcinia, dioecious tropical forest trees: the phenology, pollination biology and fertilization of G. hombroniana Pierre.

TL;DR: The ‘wet’ stigma and binucleate pollen suggest that Garcinia arose from hermaphrodite plants with a gametophytic self-incompatibility system and is considered as ‘steady state’ strategists.
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Isozymes, and the status of Taraxacum (Asteraceae) agamospecies.

TL;DR: It is concluded that dissimilarity between samples as assessed by isozymes is probably related to the time of evolutionary divergence of those samples, and although allopolyploid, and morphologically very diverse, the group 1 agamospecies may have very recently diverged asexually from a common stock.