Orchids have minute seeds and can disperse over long distances. Hedrén et al. use genetic markers to track how the marsh orchid Dactylorhiza
These multiple colonization events have resulted in a mosaic pattern of genetic variation, such that adjacent populations are not necessarily closely related. Hedrénet al. also find that the genetically most diverse populations are located at older sites, suggesting that genetic diversity builds up over time.
Floral chemistry is hypothesized to be the product of natural selection, but researchers have just begun to consider the micro-evolution of these traits.
Recent tissue-level observations made indirectly via flow cytometry show that endoreplication (partial or complete duplication of the nuclear genome in the absence of subsequent cell division) may represent a...
The potential for gene exchange between species with different ploidy levels has long been recognized, but only a few studies have tested this hypothesis in situ and most of them have focused on not more than two co...
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