The HPT-numbers mentioned here are no field numbers of collected plants. They are internal numbers (acczession numbers, receipt numbers) of the cactus collection of  Hans-Peter Thomas which are used for identification of individual plant clones in our collections. This is important since Opuntioids normally are propagated vegetatively.
Where a site locality of the respective plant is known or where a locality can be followed, this is mentioned after the plant name and the HPT-number. Otherwise the plant is mentioned as a ‚cultivation clone‘.

floccosa 'atroviridis', HPT 0595; cultivation clone

inarmata, HPT 0266; cultivation clone

pachypus, HPT 0108; Karel Knize, KK 1845, clone 1

pachypus, HPT 0130; cultivation clone

salmiana, HPT 0709; Argentina, Prov. San Luis

spec., HPT 0694; cultivation clone

verschaffeltii, HPT 0751; Bolivia, La Paz - Cochabamba, km 168

vestita, HPT 0611; Bolivia, Prov. Chuquisaca