[Edited by wcutler 2011aug3: comments removed no longer relevant after thread reorganization] With respect to P. serrulata var. spontanea, I could be convinced that many of the unknowns in East Van (500-600 blk E 27, 800 blk E 26, 1100-1200 blk E 13, etc.) are this cherry. I'd like to see whether the leaf back is whitish (which would be a good indicator). The aforementioned are for sure not P. sargentii, as the inflorescences are corymbose, not umbellate—warmer weather will show this better—and the bud scales aren't particularly sticky, either.