The plant collection at Kew is delightful. No, I didn't take detailed notes about what these are: I was too busy trying not to collapse from the heat.
The heat wave was a deterrent, but as I remarked to my cousin, the absence of ambulances parked outside suggested that it might be at least somewhat cool within the gardens.
I can pretend I'll use each of these for watercolor painting studies someday, though that remains unlikely.