Bomb gourd - Cyclanthera explodens Naud.

Japanese: バクダンウリ(爆弾瓜) - バクダンウリ（英語表記）Cyclanthera explodens Naud.

Native to tropical America, this is an annual creeping plant of the Cucurbitaceae family. The creeping stems grow to about 3m, are hairless, and have tendrils that wrap around other objects. The leaves are alternate, triangular-oval, 6-9cm long, sometimes slightly lobed and slightly concave at the base, with long petioles and slightly hairy. It is monoecious, with male flowers forming panicles and female flowers growing solitary. The fruit is fleshy, round, often curved, about 2.5cm long, and has hard thorns on the surface. When the fruit ripens, it scatters seeds far away. The scientific name explodens means to scatter vigorously.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

熱帯アメリカ原産，ウリ科のつる性一年草。茎はつる性で3mあまり伸び，毛がなく，巻きひげで他物にからみつく。葉は互生し，三角状卵形で長さ6～9cm，ときにわずかに浅裂して基部は多少凹入し，長い葉柄があってわずかに毛が生えている。雌雄同株で，雄花は円錐花序を作り，雌花は1個が単生する。果実は肉質で円く，しばしば湾曲し，長さ2.5cmくらい，表面に硬いとげがある。果実は熟すと種子を遠くに飛ばす。学名のエキスプローデンスは，勢いよく飛ばすという意味である。

出典　株式会社平凡社世界大百科事典第２版について　情報

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