We used seven microsatellite loci to characterize the genetic structure for 24 populations of Cirsium pitcheri, spanning the center to periphery of the range.

Gardening readers can buy three Cirsium rivulare 'Atropurpureum' for £9.95 or buy six for £19.90 and receive a further 3 free. All prices include postage and packing. Loose-rooted plants supplied.