For the future, we actually try to follow Calflora for California plants, not Jepson, and they still treat this as Chamaesyce. Let's just leave this one for now. All our authorities are listed at http://www.inaturalist.org/pages/curator+guide#policies

Now that Jepson updates dynamically and not with every publication of the paper edition, Calflora generally lags behind them, and I'm not sure what their schedule is. However, as a general proponent of a slower rate of taxonomic change, I actually see that as an advantage of Calflora.