Origin of the name of the pearlbush

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The flower of the Rikyu plum (pearlbush) of the garden of the house bloomed. The blog of March two years ago introduced the Rikyu plum now. , also known as father who was the thing which pulled out a main matter from the thing which searched on the Web even if said an introduction, and made a composition, but was originally from China according to it, and was brought in the Meiji era by Japan therefore is that have nothing to do with famous Rikyu Senno. Furthermore, it means that it is not the friend of the plum though it is named a plum. I was going to know why such name was acquired, but was no use. It was about an end of the Meiji that a Yangtze River basin was brought in China by thing, Japan called the origin, and はじめはも “Umezaki Japanese sunflower” and the name to say were touched, but the name called “pearlbush” seemed to settle all too soon. There are no relations with Rikyu Senno who is a person of the Azuchimomoyama era directly. Furthermore, the pearlbush is the same rose family whereas a plum is the rose family cherry tree genus, but seems to be included in the sallow genus. I did not understand the further thing this time either.