My camera is out of commission for the moment so I will describe it. I see this shrub in slightly upland from riparian zones, along with the oaks. The one on the side of the road on Piezzi is about 15 feet tall. It has small ovate shaped leaves with smooth margins, the underside is silvery and fuzzier than the top. It has persistent red berries.
Not 100%, but Calflora's only record of this plant in LA county is at this location.
much smaller leaves than previous
Cotoneaster /kəˈtoʊniːˈæstər/ is a genus of flowering plants in the rose family, Rosaceae, native to the Palaearctic region (temperate Asia, Europe, north Africa), with a strong concentration of diversity in the genus in the mountains of southwestern China and the Himalayas. They are related to hawthorns (Crataegus), firethorns (Pyracantha), photinias (Photinia) and rowans (Sorbus).