Solanum nigrum ("Inuhozuki")

Japanese name: イヌホオズキ （犬酸漿）
Scientific name: Solanum nigrum

[Overview]
An annual or short-lived perennial, 20–90 cm tall, found along roadsides and in fields.
The stem is erect and much branched, and is hairless or sparsely hairy.
The leaves are simple and alternate, 3–10 cm long and 2–6 cm wide, broadly ovate, with entire margins or wavy teeth.
The petiole is 1–5 cm long and winged.
The flowers are borne 4–8 per umbel.
The corolla is 7–10 mm across, white, and 5-lobed.
The fruit is spherical, 6–7 mm across, and ripens black.

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