Find location #3!
Well done, you solved puzzle #2! The prunus sieboldii (a flowering cherry species) you found in the nonogram is just one of 13 plants named after Siebold. Because he was the only Westerner allowed into Japan at that time, he was the first to record many native species using Western scientific methods. That is why he could give them his own name.
As a reward for solving the puzzle, you get a symbol for the end solution. Remember it well!
And here is a photo clue for the next location of the treasure hunt, puzzle #3: