I'm terrible at cacti ID's....
but I think the first one might be a Mammillaria elongata variety...

Josh

1 Mammillaria elongata (not peanut cactus)
2 Could be an Echinopsis (Trichocereus)

More information, hybrids or native species? Anything else you can tell as a description?

Hi everyone,
Thank you so much for your input! I will research the IDs that you have spoken of.
To answer your question (norma_2006), I can't really give you any additional information. The first one (M. elongata) was given to me as a gift with no ID and I've always been curious as to what it was. The second photo (the one I thought was Echinopsis) was purchased online and the person told me it was an Echinopsis hybrid species. Like I said earlier, I've never seen it flower nor has it ever branched. It just continues to grow vertically.
I will look into Trichocereus to see how to care for it.
Thank you again for ALL your help.:)

Best regards,
-duc nguyen.

I'm not great at IDing, but I do know the second cactus needs more light, because it looks rather etiolated.

Second one may be a Chamaelobivia.

Steve

Chamaelobivia, also known as "peanut cactus" ...

Possible, if it is small enough, but they usually offset frequently. These Echinopis/Lobivia/Trichocereus/Chamaecereus/Acanthocalycium etc. hybrids are difficult to tell apart, even with a flower.

I grow Schick hybrids, most are not as tall as that one, and darker green, though the spines and ribs seem the same, and the Schick hybrids do have all of the species in them that is mentioned above, including Rebutia. Well not quiet all of them. And they can be figured out by the flower, if you have the flower chart in color to do so. Keep your labels make duplicate copies of them, and put one in the bottom of the pot. Not all of them look alike, some hardly have any spines, and others have long ones, Bob Schick used to tell them apart by looking at them. Sorry for such a long post, Echinopsis are grown just like any other cactus and need the same care, for flowering give them a low 0-20-10 fertilizer approx. The middle number must be higher, the first number very low. No water in the Winter, they must have the chill and dormant periods to flower. They are extremely hardy, will flower 6 mo. at least of the year from the end of April to the end of Sept. depending on you climate, light where you grow them, feeding. May open 4 nights depending on light. Norma

Hello again! Wow...interesting feed back and again, I appreciate all your input. I've been researching the various possibilities that I've been reading above. The Echinopsis 'peanut cactus' one look almost identical; however, mine does not produce all the offshoots. It is just the one column. I looked into Trichocereus and found this species: Trichocereus spachianus. That so far has been the closest resembling one. I am not sure though because I've yet to see it flower. I live in the Dallas/Ft Worth area and have actually been able to plant them directly in the ground here and they survived this past winter (we got over 10" of snow which is extremely unusual here)! I also have a few offshoots still growing in pots. In the photo above, the growth deformity that you see maybe from me keeping that plant indoors and bringing it outside for the summer? I have no idea.

You have offshoots in pots despite that the plant has not produced any offshoots? Did you have several from the beginning?

The deformity is typical for a cactus that has experienced a change in growing conditions, i.e. weaker light or possibly root damage. If it grew while indoors it could be the reason.

Or perhaps the offshoots come from a different species not mentioned in your first post?

Ohh no! I apologize. I was not clear at all when I posted that. I started off with just one plant. It had gotten so tall that it fell over so I ended up having to do cuttings on the original plant because it was so heavily damaged. The 'offshoots' I was referring to are the results of those cuttings. Again, I apologize for the confusion. This plant has never produced any REAL offshoots.