Dahlia imperialis ... F2 hybrids?

Hillsborough, NC(Zone 7b)

Ok, I'll bite. I know what Dahlia imperialis are (and afford them their due reverence, of course), and I know what F1, F2, etc. means, but what are 'F2 hybrids' in this context? The entry in the plant database in this case has very little information, and I didn't find much in internet searches, either.

https://davesgarden.com/guides/pf/go/218534/

Can anyone explain to me what exactly this is?

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