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How selfing and intra- and interspecific crossing influence seed set, morphology and ploidy level in Euphrasia : An experimental study of species occurring in the Alps of Switzerland

Liebst, B. ; Schneller, J.

In: Plant Systematics and Evolution, 2005, vol. 255, no. 3-4, p. 193-214

Are tetraploids more successful? Floral signals, reproductive success and floral isolation in mixed-ploidy populations of a terrestrial orchid

Gross, Karin ; Schiestl, Florian P.

In: Annals of Botany, 2015, vol. 115, no. 2, p. 263-273

Shift in cytotype frequency and niche space in the invasive plant Centaurea maculosa

Treier, Urs A. ; Broennimann, Olivier ; Normand, Signe ; Guisan, Antoine ; Schaffner, Urs ; Steinger, Thomas ; Müller-Schärer, Heinz

In: Ecology, 2009, vol. 90, no. 5, p. 1366-1377

Polyploidy is often assumed to increase the spread and thus the success of alien plant species, but few empirical studies exist. We tested this hypothesis with Centaurea maculosa Lam., a species native to Europe and introduced into North America approximately 120 years ago where it became highly invasive. We analyzed the ploidy level of more than 2000 plants from 93 native and 48 invasive C....