Sorry for not being clear...the plant itself (mazatlanensis) is quite dark...not the flower....

As Russell noted above, it could also be a mam mazatlanensis which has a similar flower but is of a much darker color... this is mine:

could be a mam boolii...looks similar to mine

WOW...thank you for the answer !!!

I've had this one for approximately 12 years and it was at least 3-4 years old when I got it. It is approximately 10+ inches tall (28 cm) and the spines are about 3 in. (8 cm) long. The pictures show with/without flowers. Any idea what it might be? Thank you.

Thank you. That appears to be a definite possibility and I'll go with that unless someone else has a "for sure" option. Again thank you

I've had this guy for 10+ years. It bloomed once years ago (yellow) but has since just sat quietly growing. I'm almost sure it is a corypantha but do you know what species? Thank you.

I noticed that and that is what led me to believe that they might be different species. Thanks

Yes...I checked that out and i think you are correct...thank you

Wonderful...thank you so much !!!

Thank you for your help. Now I'll now see if i can revive it. My wife will be happy and if she is happy life will be good.

These look very similar to me but the spinage is a bit different. The first one has never bloomed for me in 5+ years...it is 3.5 inches tall and 5" wide...the second one is 3 inches tall and 3.5 inches tall...the blooms are evident. Are these the same type? Thank you for any help.

Mt wife got this for me because "its cute" ! I have no idea what it is. Its small (3 inches) and does not like the sun. I had it under a 50% shade cloth but it does not the Arizona summer sun and heat. I have since put it in the bright shade...it was a nice green color. Its reaction has ca...

Thank you all. I will put it back in the last row and enjoy looking at it from the same direction as previously. Perhaps one day it will flower but i still like it and it is healthy

This plant has been in the last row of my "cactus cage"; it has been healthy (at least I thought it was healthy) but never bloomed. Now that I am out of the hospital and able to reach plants in the last row, I was shocked at the split in the backside. It still looks good from the front but...