They were Japanese pictures of “浴恩園真景図巻”, which was originally painted by Bunryo Hoshino (星野文良) of 19C in Edo period. They are manuscript of Meiji period (1881) by Baisai Sakai (酒井梅斎). They represented the beautiful scene of Hama-rikyu garden by the Japanese‐style painting.
You can see many blossoms and flowers in Hama-rikyu in this picture.
From Senjyu-kan to the pond of Harukaze at Hama-rikyu garden