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Rebutia
http://www.bcss-liverpool.pwp.blueyonder.co.uk/rebutia.htm
Images.
Rebutia
http://www.desert-tropicals.com/Plants/Cactaceae/Rebutia.html
Images of many species (incorporating the genera Aylostera, Mediolobivia, Rebutia, Sulcorebutia, and Weingartia Rebutia).
Rebutia
http://homepage.powerup.com.au/~cssq/articles/rebutia.html
Description of the genus by Doug Snell.
Rebutia
http://www.cactuscollection.net/Cacti/R/Rebutia/fiebrigii/fiebrigii_1.htm
Images of several species.
Rebutia elegans
http://florawww.eeb.uconn.edu/acc_num/198900059.html
Rebutia marsoneri
http://www.dipbot.unict.it/orto/0972-1.html
image