Opuntia engelmannii f. linguiformis
[= Opuntia linguiformis
& Opuntia lindheimeri var. linguiformis
& Opuntia engelmannii var. linguiformis]
| This popular cultivar was originally collected near San Antonio by David Griffiths around 1906.
It is believed to be either some sort of a hybrid or a mutant as it has never been re-encountered except as individuals that have 'escaped' from cultivation.
While often flowering and fruiting profusely, it is reported to be sterile and is entirely reproduced vegetatively.
Benson preserved it as a variety of lindheimeri, Parfitt & Pinkava regarding it to be a variety of engelmannii, but it seems doubtful it should be regarded as more than a cultivar or form of engelmannii var. lindheimeri.