Echinopsis caineana, from Bolivia, is from the group in the genus which used to be called Lobivias, but it is not typical of this group. Most of the Lobivia-type Echinopsis have small globular plant bodies, often clustering to form a tight group, but this one is single and short-columnar. Ours is about 30 cm tall, which is huge for a Lobivia. Its lavender-pink flowers are stunning.
I have one of these - maybe it’ll flower this year.
Echinopsis rowleyi is a Trichocereus-type Echinopsis, though it was once known as Lobivia grandiflora. I imagine that it must be one of the parents of the spectacularly flowered Echinopsis hybrids that display this growth habit. From northwestern Argentina.