The subrotunda will reseed for you. Iodantha I only have right now as small seedlings so I don't know how it will do here, but should do well. At least I think I still have seedlings out there, better go check. I got seeds from Robin and then lost them, found them much later after and was surprised they germinated after the flat had been neglected and dried out....it's been a hard year....lol..
Zone 7...are you on a Bay Area ridgetop, or in the digger pine belt? Aren't those both zone 7?