Echinocystis is a monotypic genus in the gourd family Cucurbitaceae, placed in the order Cucurbitales. It contains a single species, Echinocystis lobata, commonly known as wild cucumber or prickly cucumber, an annual vine native to North America. The genus was described by John Torrey and Asa Gray, published in 1840 in Flora of North America.
E. lobata is a fast-growing climber, producing angular, furrowed stems up to 8 m (26 ft) long that scramble over shrubs and fences with the help of coiling, branched tendrils. Its alternate leaves are long-petioled with five palmate lobes. The plant is monoecious, bearing separate male and female flowers: upright panicles of small white to greenish-yellow male flowers with a six-lobed corolla, and solitary female flowers with a spiky, globular inferior ovary at their base. The distinctive fruit is a prickly, inflated capsule up to 5 cm long containing four seeds — resembling a miniature spiny watermelon or cucumber, though it is inedible. The capsules persist through winter before splitting open at the base to disperse their seeds.
Within its native North American range, which spans some forty U.S. states and nine Canadian provinces, E. lobata is easily confused with other clinging, cucumber-like vines. It can be told apart from the bur cucumber (Sicyos angulatus) by its six-lobed corolla and single (rather than clustered) fruits, and it superficially resembles Marah macrocarpa, a perennial also called "wild cucumber" native to Southern California chaparral, where Echinocystis does not occur. Outside North America, the species has become established as an adventive or locally invasive plant in parts of Europe, including protected landscapes in Hungary and Romania.
The vine supports a small community of associated insects, serving as a host or nectar source for several wasps, beetles, and true bugs, and it is susceptible to bacterial wilt spread by the striped cucumber beetle. Historically, several Native American groups used the plant medicinally: the Taos Pueblo applied it to treat rheumatism, while the Menominee prepared a bitter root extract used as an analgesic and, reportedly, a love potion.
Distribution
Native across roughly forty U.S. states and nine Canadian provinces in North America. It has also been recorded as an uncommon invasive or adventive alien plant in parts of Europe, including the Örség Landscape Protection Area in Hungary and the Carei Plain natural protected area in Romania.
Ecology
The vine hosts several insects, including the leaf-footed bug Anasa repetita and the pentatomid Euschistus servus euschistoides, and its flowers are visited by scoliid and tiphiid wasps and a soldier beetle. It is susceptible to bacterial wilt (Erwinia tracheiphila), spread by the striped cucumber beetle.
Taxonomy Notes
A monotypic genus (family Cucurbitaceae, order Cucurbitales) first described by Torrey & A. Gray in 1840. Its sole species, E. lobata, is distinguished from the similarly clinging bur cucumber (Sicyos angulatus) by its six-lobed corolla and solitary (not clustered) fruit, and superficially resembles the unrelated Marah macrocarpa of Southern California, another plant called "wild cucumber."
Cultural Uses
Several Native American groups used the plant medicinally — the Taos Pueblo to treat rheumatism, and the Menominee as a bitter root-based analgesic and purported love potion. The powdered root was also used in poultices for headaches, and the seeds were used as beads.
