Canotia holacantha Torrey is reported from the Gulf of California, Mexico on Isla Tiburón. This population is isolated from its closest conspecifics in northern Sonora by 230 km and is best explained as a Pleistocene relict. Previous reports of this species on Tiburón and differences between other “crucifixion thorns” are explained.
Canotia Holacantha On Isla Tiburón, Gulf Of California, Mexico
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