Solanum americanum (American black nightshade, "Teriminoinuhozuki")

Japanese name: テリミノイヌホオズキ （照実犬酸漿）
Scientific name: Solanum americanum

[Overview]
An annual or short-lived perennial.
The flowers are borne 5–10 in an umbel.
The corolla is white, 4–6 mm across, and 5-lobed.
The fruit is spherical, 4–7 mm across, ripens blackish purple, and is strongly glossy.
The flesh is also blackish purple.
The fruit contains 1–4 spherical granules.
The fruit falls leaving the calyx behind.
It is a highly variable plant, and the characteristics of the stems and leaves vary.
The commonly seen type has the following characteristics, among others.
The stem is soft and much branched, and the long stems fall over and spread over the ground.
The leaves are ovate to triangular-ovate, with shallow wavy notches in the lower half, few hairs overall, and short hairs only on the veins of the underside.
The small flower stalks bend, and the fruits hang down.

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