Ecballium Genus

Ecballium is a small, monotypic genus of flowering plants in the family Cucurbitaceae (order Cucurbitales), erected by Achille Richard in 1824. It contains a single accepted species, Ecballium elaterium, widely known as the squirting cucumber. The plant is a herbaceous perennial with a tuberous root, usually trailing along the ground but occasionally growing in a more shrubby habit, with bristly stems and rough, bristly-hairy, greyish-green lobed leaves.

Its flowers are five-lobed and yellow, 2–5 cm across, maturing into an oval, green to blue-green fruit around 5 cm long that resembles a small, hairy cucumber. The genus's common name comes from the fruit's distinctive method of seed dispersal: when ripe, the fruit detaches explosively from its stalk and squirts a stream of mucilaginous liquid carrying its seeds several metres, an example of rapid plant movement (ballochory).

Ecballium is native to southern Europe, northwestern Africa, and southwestern Asia. It has been cultivated as an ornamental elsewhere and has naturalised in Australia, central and western Europe, central Asia, New Zealand, and eastern North America, where it is regarded as an invasive species.

The plant has a long history in folk medicine: its fruit juice yields elaterin (elaterine), a cucurbitacin compound isolated by Stirling in 1835 and historically used as a powerful purgative, formulated in the British Pharmacopeia as "Pulvis Elaterini Compositus." Nineteenth-century sources described it as the most potent hydragogue purgative known, to be used only with great care. Today, elaterium and its constituents are recognised as toxic, with modern case reports linking nasal or oral exposure to hospitalisation, swelling of the uvula, and necrosis of the nasal mucosa.