Chelidonium majus, commonly known as greater celandine, is a herbaceous perennial plant belonging to the poppy family, Papaveraceae. It is recognized for its distinctive bright orange sap and its historical use in traditional medicine. This species is native to Europe and western Asia, extending into North Africa. Greater celandine typically grows to a height of 30 to 100 centimeters, forming a somewhat bushy habit. The stems are erect, branched, and sparsely covered with fine hairs. Its leaves are pinnately compound, with three to seven ovate to oblong leaflets that are deeply lobed or toothed, giving them a somewhat fern-like appearance. The upper surface of the leaves is a dull green, while the undersides are paler and often hairy. The plant produces clusters of bright yellow, four-petaled flowers, each about 2 to 3 centimeters in diameter. These flowers bloom from late spring through summer. Following flowering, the plant develops long, slender seed capsules, which are typically 4 to 6 centimeters in length. When mature, these capsules split open to release numerous small, black, glossy seeds. A notable characteristic of Chelidonium majus is its thick, reddish-orange latex, or sap, which is exuded when any part of the plant is broken. In its native range, greater celandine thrives in a variety of habitats, often found in woodlands, hedgerows, disturbed ground, and along roadsides. It prefers moist, well-drained soils and can tolerate partial shade to full sun. While it is not widely cultivated as an ornamental, it can be grown in gardens, particularly in naturalistic settings. Its cultivation requirements are generally straightforward, favoring moist soil and a location that is not excessively dry. Historically, Chelidonium majus has been valued for its medicinal properties, with the bright orange sap being the primary source of its traditional applications. It has been used externally for skin conditions and internally for various ailments, though its use requires caution due to the presence of alkaloids, some of which can be toxic. Scientific research has investigated the phytochemical constituents of greater celandine, identifying various alkaloids and other compounds. Its ecological role is primarily as a component of its native flora, contributing to biodiversity in its natural habitats. It is not typically considered a significant agricultural crop, nor does it have widespread culinary uses. An interesting adaptation of Chelidonium majus is its seed dispersal mechanism. The seeds contain a fleshy appendage called an elaiosome, which is attractive to ants. Ants carry the seeds to their nests, consume the elaiosome, and then discard the seed, thus aiding in its dispersal. The plant's vibrant orange sap, which gives it its common name, is a defense mechanism against herbivores and has been the subject of considerable ethnobotanical and pharmacological interest.