Sorry we haven't been able to help. I keep thinking I should know it, but can't come up with it. We usually have people here that are pretty good at the ID's.
Your local cooperative agricultural extension office and master gardeners program is at UC Santa Clara:
https://cesantaclara.ucanr.edu/ If you send them your pictures or maybe a sample cutting, they should be able to ID it for you.
Let us know if you get an ID, please!
