Echinopsis and Gymno

[Briguytm]

First I bought this one labeled Echinopsis sp. What does sp. mean? and can I get an ID on the species please?


get a url for a photo


get a url for a photo

Second, I also recently bought this cactus labeled Gymnocalycium friedrichii:


get a url for a photo

and I bought this cactus a while ago which was labeled friedrichii:


get a url for a photo

Are these really the same species? and if so anyone know the reason for the obvious difference in appearance.

Thanks for every ones help

[Kamos]

The first cactus is Echinopsis eyriesii. The sp. is short for species.
The first Gymno. may be mihanovichii and the second one G.mihanovichii friedrichii.

[stefan m.]

First gymnocalycium is baldanium.(mihaolovichi has rough stems)
The other echinopsis is ancistophora.