Revised on 29 August 2024
I initially published this post a couple of days ago and since then something's been bothering me. These fruits grow upward while the fruits on the black nightshades I saw other times all grew downward. That made me wonder if these are really black nightshade. I did research and learned they were black nightshade, but the American one, i.e., American black nightshade (Solanum americanum).
Its Japanese name is kanzashi black nightshade after the fruits being shaped like "kanzashi," i.e., hair ornaments like barrettes used in traditional Japanese hairstyles.
Initially published on 27 August