Name: Daisy I Reno, Nv (Zone 6b) Not all who wander are lost
I don't know either but if it came up in my yard, I'd keep it.
Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and proclaiming...."WOW What a Ride!!" -Mark Frost
President: Orchid Society of Northern Nevada
Webmaster: osnnv.org
Name: Leslieray Hurlburt Sacramento California (Zone 9b)
Could it be a Glaucium? I'm growing one that made me think they may be related. I've read that in some places mine is a weed. I would love to have whatever yours is also. It's looks gorgeous.
Hamilton Square Garden, Historic City Cemetery, Sacramento California.
Name: Lauri N Central Wash. - the dry side (Zone 5b)
It looks like it could be something in the Dusty Miller family except for the description of 'rubbery leaves'. Dusty Miller is soft and velvety, not rubbery. Whatever it is, it's gorgeous!
I found out it is euphorbia Decaryi? It is a succulent found mostly in tropical and sub tropical conditions but also in rocky places. I could fill a semi trunk with all of them around here. And I only noticed them this year on a hike. Cool.
Name: Lauri N Central Wash. - the dry side (Zone 5b)
The picture looks pretty close, but I have to wonder at the hardiness factor. You say it's growing wild in Colorado? Not really subtropical. I found one source that listed it as only hardy to 40°.