Name: Evan Pioneer Valley south, MA, USA (Zone 6a)
Hi Kelli,
Based upon the descriptions noted in my original post and the following link, it appears yellow berries are Toyon (Heteromeles arbutifolia var. cerina) so I'll move the photo.
www.fs.fed.us/database/feis/plants/shrub/hetarb/all.html
Morphological distinctions between varieties are presented below
[45,46]:
H. a. var. arbutifolia - typical variety; fruit red
H. a. var. cerina - fruit yellow
H. a. var. macrocarpa - large fruited form; fruit red; leaves subentire
