Cochlearia, commonly known as scurvy-grass or spoonwort, is a genus of roughly 30 species of annual and perennial herbs in the family Brassicaceae (the mustard family). The plants are characteristically low-growing, forming rounded or creeping mats typically 5–20 cm tall. Their leaves are smoothly rounded and roughly spoon-shaped — a form that inspired the genus name, from the Latinized Latin cocleare derived from Greek κοχλιάριον (kokhliárion, "spoon") — and have a distinctively fleshy texture, usually 1–5 cm long. In some species the leaves are lobed rather than entire. The flowers are white, four-petalled, and carried in short racemes, following the typical Brassicaceae floral plan.
The genus is distributed across temperate and arctic regions of the northern hemisphere. It is most frequently encountered in coastal habitats — cliff-tops, salt marshes, and estuarine margins — where an exceptional tolerance of salt allows it to occupy niches that exclude most competing vegetation. Cochlearia also extends into alpine zones, mountain grasslands, and tundra. About 15 species are currently accepted, among them Cochlearia officinalis (common scurvy-grass), C. danica (Danish scurvy-grass), C. anglica (English scurvy-grass), and C. groenlandica (Greenland scurvy-grass). Two former members, horseradish (Armoracia rusticana) and wasabi (Wasabia japonica), have been reassigned to separate genera.
Scurvy-grass has a long history of use as an antiscorbutic. The leaves are rich in vitamin C and were frequently eaten raw or cooked by sailors returning from long voyages. Pliny the Elder (AD 23–79) may have referred to the plant in his Naturalis Historia as a remedy for a scurvy-like disease among Roman soldiers. The 1676 treatise Cochlearia curiosa brought the plant into wide repute, and by the nineteenth century C. officinalis was formally described in medical literature as a "gentle stimulant, aperient, and diuretic" with established antiscorbutic properties.
Etymology
The genus name Cochlearia comes from the Latinized Latin cocleare, itself derived from the Greek κοχλιάριον (kokhliárion), a diminutive meaning "little spoon" (from κόχλος, kókhlos, "seashell"). The name refers directly to the spoon-shaped outline of the leaves, which was a striking enough feature to name the entire genus.
Distribution
Cochlearia species are distributed across temperate and arctic regions of the northern hemisphere. They are most characteristic of coastal habitats — cliff-tops, salt marshes, and estuarine edges — but also occur in alpine habitats, mountain grasslands, and tundra. Their high salt tolerance is a key ecological trait that allows them to thrive in coastal environments where competition from larger plants is reduced.
Ecology
The genus shows a strong association with high-salinity environments. Salt tolerance is the primary ecological trait enabling colonisation of cliff-tops, salt marshes, and estuaries, habitats where most herbaceous competition is excluded. Alpine and tundra populations occupy similarly exposed, low-competition niches at altitude.
Cultural Uses
Scurvy-grass has been used for centuries as a dietary source of vitamin C. Sailors on long voyages ate the leaves raw or cooked to prevent and cure scurvy. Pliny the Elder may have recommended a related plant (Herba britannica) for scurvy-like symptoms among Roman legions in Germany. The 1676 book Cochlearia curiosa codified the plant's medical reputation, and in 1857 C. officinalis was officially described as an antiscorbutic in The Elements of Materia Medica and Therapeutics. The leaves have a peppery, acrid flavour similar to watercress or horseradish and are sometimes used in salads.
History
The medicinal importance of Cochlearia was documented as far back as the first century AD (Pliny the Elder). In 1662, the Rev. George Moore recorded purchasing scurvy-grass in both bundled and bottled form. The treatise Cochlearia curiosa: or the curiosities of scurvygrass was published in 1676 and praised by the Royal Society for its systematic account of the plant's varieties, habitats, and medicinal virtues. The genus formerly included horseradish (Armoracia rusticana, previously Cochlearia armoracia) and wasabi (Wasabia japonica, previously Cochlearia wasabi), both now placed in separate genera.
