Solanum ptychanthum (west Indian nightshade, "Amerikainuhozuki")

Japanese name: アメリカイヌホオズキ
Scientific name: Solanum ptychanthum

[Overview]
An annual or short-lived perennial 40–80 cm tall, found along roadsides.
The stem is erect and much branched, and almost hairless.
The leaves are simple and alternate, ovate to long ovate, thin, and entire or with a few teeth.
Umbels arising partway along the stem carry 2–5 flowers.
The corolla is about 8 mm across, white sometimes tinged with purple, and divided into 5 star-shaped lobes.
The fruit is spherical, 5–9 mm across, glossy, and ripens black.

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