Tracking down Luther Burbank, two girls, and a dog

I recently saw two intriguing photos in the California Nursery Company archives. In the photos Luther Burbank is standing in a group near two girls and a dog in the front row. George C. Roeding is also in the front, on the right. Probably lots of other movers and shakers of the nurseryman world in these photos. Who are they? I was curious.