Small Purple Flowers Spread on the Ground of Shinjuku Central Park

Canon EOS 6D, Canon EF50mm F1.4 USM (50mm, f/2.8, 1/160 sec, ISO-100)

I came to Shinjuku Central Park for two days in a row. I only took photos of the fresh green yesterday. But today, I took a photo of Japanese Wild Radish, small purple flowers on the ground. I find it quite interesting because this flower blooms in different colors. Purple in some cases, white in other cases, and purple and white in the other cases. Perhaps this flower has other colors, too.