Revision of Opuntia humifusa complex
On opuntiads.com "Taxonomic revision of the Opuntia humifusa complex (Opuntieae: Cactaceae) of the eastern United States" is freely downloadable:
https://opuntiads.com/records/Taxonomic%20revision%20of%20the%20Opuntia%20humifusa%20complex%20in%20eastern%20usa.pdf
Other precious resources can be found in the opuntiads website:
https://opuntiads.com
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