ID help please

[Xericfan]

Sold to me as an Echinopsis terscheckii, but doesn't look the part. It's been in the ground 2 years, is nearly 5' tall x 8" in diameter, but was no more than 2' when planted.

[HP22B]

Certainly looks like terscheckii to me.

[Xericfan]

Thanks for your response. I have several other terscheckiis that all look like this, and are not growing as rapidly:

[greenknight]

Hybrid, maybe.

[litoriachloris]

First one T. tercheckii second one looks like T. pasacana.

[Xericfan]

Thanks. I'll check that out.