Audrey, that is not a stupid question.
The hueffelii are now listed as a species type of sempervivum. It used to be classified as a Jovibarba species, as in Jovibarba heuffelii.
So now it would show as Sempervivum heuffelii 'Bronze Ingot'.
It took me awhile before I could tell them apart from the other sempervivum types. The just have a different look to them, and they do not send out offsets on stolons like the sempervivum do. The produce new offsets by increasing from the same crown of the main rosette, usually between the leaves.
Like this one.
Here is what used to be Jovibarba globiferum subsp. hirtum, and is now classified as Sempervivum globiferum subsp. hirtum (the common name is rollers). Their offsets form on very short thin stolons which break and the offset (ball) rolls away from the parent rosettes and puts down roots.
This Sempervivum tectorum type sends offsets out on nice strong stolons that keep the offset attached to the parent rosette until they form roots and establish themselves. They are fed by the mother rosette thru the stolon, until they get established.
Hope this makes sense?
