Succisa pratensis

Morphological description

Perennial plant that can reach a variable height between 20 and 80 cm, with an erect habit and often branched in the upper part of the stem. The stem is cylindrical and has a pubescent surface, especially in the upper part, where one or two pairs of branches can also be observed.

The root system consists of an oblique, short and superficial rhizome, characterized by a truncated shape at the base, without stolons. The basal leaves have a winged petiole 2-3 cm long and a lanceolate blade measuring 2-3 cm in width and 6-8 cm in length. The leaf margin is darkly dentate and the lower surface appears hirsute (i.e. covered with hairs). The cauline leaves, on the other hand, are smaller, linear and also with dentate margins, arranged alternately along the stem.

The flowering heads are initially spherical and become hemispherical at flowering, with a diameter ranging from 1.5 to 2.5 cm. They are borne on peduncles 4 to 15 cm long. The involucre is made up of two or three series of herbaceous, patent (i.e. open outward) scales, which at anthesis (peak flowering period) are exceeded by the flowers. The chaff that accompanies the flowers is linear-spatulate and acute.

The flowers are regular, with a lilac or blue-violet corolla, rarely they may also have pink or white coloration. The corolla is 4-7 mm long, with four lobes of which the lower one is more elongated. The style protrudes beyond the throat of the flower, a feature that facilitates pollination. The fruits are cypselae (dry indehiscent fruits) about 3-5 mm long, hirsute with upward-facing hairs, with an involucre reduced to 4 teeth and a calyx equipped with 4-5 dark and elongated bristles (twice as long as the calyx limb).

Habitat and distribution

This species is widely distributed in Europe, from the Eurasian continent to North Africa. In Italy it mainly grows in wet meadows and fresh woods, from the plains up to about 1600 meters altitude, with occasional reports up to 2400 meters. It prefers environments with variable exposure, but is typically associated with moist or subhumid substrates, such as marshy meadows, forest clearings and mountain pastures.

The plant is present throughout the Italian peninsula and in Mediterranean regions, where it finds suitable conditions especially in cool and humid areas. In the Mediterranean context, its presence is limited to microhabitats with constant humidity, given its preference for soils that are not too dry and often rich in organic matter.

Flowering period

Flowering generally occurs between June and August, with some extension until September-October in cooler or mountainous areas. Overall, the peak flower development period is in the summer season, when temperature and humidity conditions are ideal for pollination and fruit maturation.

Ecology and pollination

The plant is a scapose hemicryptophyte: the stem is elongated and often leafless in the upper part, with perennial buds located at ground level. The flowers are all similar to each other, without differentiation between peripheral and central flowers, and have a corolla with four equal lobes (the lower one slightly elongated), indicative of adaptations to insect pollination.

The main pollinating insects are bees and butterflies, attracted by the lilac color and the nectar produced. The style protruding beyond the throat facilitates contact with pollinating insects. The plant is often gynodioecious, i.e. it presents individuals with hermaphrodite flowers and others with female flowers, a strategy that favors genetic diversity.

Seed dispersal occurs through fruits equipped with hairs that can facilitate adherence to animals or transport by wind. The superficial rhizome also allows some clonal expansion of the plant.

Curiosities and traditional uses

The common name “Devil’s bite” derives from a legend according to which the devil bit the rhizome of this plant to prevent its therapeutic use by humanity, recognizing its important healing properties.

Traditionally, Succisa pratensis has been used in phytotherapy for its anthelmintic (against intestinal worms), soothing, purifying, diuretic, febrifuge, expectorant and emmenagogue properties. Teas prepared with the leaves were used to relieve cough, fever and inflammation, while decoctions for external use found application in the treatment of eczema and other skin eruptions.

The tender shoots are sometimes used in salads, while a green dye was obtained from the leaves. These food and medicinal uses testify to an ancient knowledge of the plant’s virtues, although today it is advisable to use such remedies with caution and under medical supervision.

Etymology

The scientific name derives from the Latin “succidere”, which means “to cut at the base” or “to truncate”, probably referring to the characteristically interrupted or “bitten” rhizome. The specific term “pratensis” indicates the typical habitat of the plant, i.e. meadows.

The Italian common name “Devil's-Bit Scabious” is linked to a popular legend widely spread in various European cultures, which attributes magical and healing powers to the plant hindered by a demonic figure who supposedly “bit” its root.

Sources

• Prof. P.V. Arrigoni, "Flora analitica della Toscana", "Flora dell'Isola di Sardegna"
• Acta Plantarum - Flora delle regioni italiane (scheda di Gianluca Nicolella)
• Tela Botanica / H. Coste, "Flore descriptive et illustrée de la France"
• World Flora Online (WFO)