I've had this guy a couple years now.
I think the key to it ID is the lateral spines, they are unusually curved, the pictures are rough but I think they are clear enough to show it, it may be more clear in the imprints the leave in other leaves.
What's not visible is the very rough texture of the leaves, it's some of the roughest I've felt on an agave! I'm not that experienced with them tho...
It's not a fast grower, but not super slow.
It's rather slow to offset, but does manage atleast one or 2 a year, they are a slow to establish after splitting off.





Thanks!

This looks like an Agave potatorum that is growing in less than optimal light. I had one that looked just like yours, then I moved it into full sun, and it now looks like this...


edited to add…this is a pic. of my plant before...

Defiantly not potatorum!

I'm rather familiar with that species.
I've got a variegated form and a plain blue form of potatorum.
They are more of a ball shape, producing numerous short wide leaves, with a very short tapered point to the leaf and a much more fine terminal spine.

My plant has certainly not experienced too little sun in the time I've had it!
It roasts in full sun all day, up until 2 weeks ago, when I drug it in, the color on the fresh growth in the 3rd pic is a little yellow tho...

From your description of "imprints" in the leaves, how about A. cupreata? http://www.succulentguide.com/...

edited to add: If it is A. cupreata, we currently have no photo's in the database; *hint* *hint*: Maguey Papalote (Agave cupreata)

Good hit Lin!

Sorry, mine was ID'd as potatorum, and I thought yours looked like mine. I wonder if mine really is A. potatorum…hmmm.

LOL, it's just a wild guess on my part ... I'm so NOT good at comparing photo's and there are always lots of misidentifications out there on the web.

I'd say your plant is potatorum!
It's known as the butterfly agave for the distinct leaf shape.