Chondrilla juncea

Morphological description

Biennial or perennial herbaceous plant, with scapose habit and variable height between 30 and 120 cm. The stem is erect, cylindrical and angled, often branched-ascending, with a glabrous surface in the upper part and glaucous with rough hairs and backward-pointing spinules of 1-2 mm in the lower part. The branches are thin, rigid and sparse, giving the plant a slender and branched structure.

The basal leaves are gathered in a rosette adhering to the ground, oblanceolate in shape, 4-8 cm long and 1.5-3.5 cm wide, with crenate-dentate or runcinate (with rounded teeth) margins, often coarsely toothed. During flowering, these basal leaves tend to dry out and fall. The cauline leaves are instead linear, narrow (2-10 cm long by 1-8 mm wide), generally smaller, with spiny or spinulose edges, and arranged along the stem parallel to the sun rays, a characteristic that earned the plant the nickname "compass plant".

The capitula are numerous, subsessile (almost without peduncle), often grouped in clusters of 2-5 elements placed in the leaf axils or terminal on the branches. The involucre is narrow, cylindrical, 10-12 mm long and about 5 mm wide, composed of biseriate scales: the lower ones are ovate (1-2 mm), the upper ones linear and acuminate (0.5-1 mm wide by 8-14 mm long). The flowers are all ligulate, bright yellow in color, about 10-13 mm long, with actinomorphic symmetry and scapose habit.

The fruit is a spoon-shaped achene, about 3.5 mm long, with a muricate surface (provided with small outgrowths) and a filiform beak about 4 mm long, at the base of which is a pappus of white, non-plumose, 6-8 mm long and denticulate bristles, which favors anemochorous dispersal (transport by wind). The root system is taprooted, with a robust main root.

Habitat and distribution

The species is widespread throughout Italy and much of the Mediterranean basin, with documented presence also in central and southern Europe, North Africa and western Asia. It prefers thermophilic and arid environments, such as uncultivated lands, dry meadows, edges of paths, roads and abandoned cultivated fields. It adapts to different soil types, preferring well-drained, sandy or rocky soils. It grows from sea level up to about 1700 meters altitude, with greater presence in hilly and foothill areas.

It is often associated with synanthropic environments, i.e. linked to human settlements and disturbed areas, where it can form stable populations although in recent decades a certain rarefaction has been observed in some areas.

Flowering period

Flowering generally extends from June to September, peaking in the summer months, in line with the Mediterranean climate. In more northern or mountainous areas flowering may occur later, up to early autumn.

Ecology and pollination

The plant is mainly pollinated by pollinating insects attracted by the bright yellow color of the ligulate flowers. The structure of the capitula, with numerous ligulate flowers, facilitates access to small pollinating insects, particularly wild bees and other hymenopterans. Seed dispersal occurs thanks to the plumose pappus which allows transport over short and medium distances by wind.

The arrangement of the leaves along the sun rays in a parallel way (characteristic called "compass plant") is an ecological adaptation that reduces direct exposure to high temperatures and intense light, optimizing tolerance to drought conditions.

Curiosities and traditional uses

Common lattugaccio is a medicinal and food plant traditionally used in various Italian areas. The young basal rosettes, before flowering, are consumed raw in mixed salads, appreciated for their slightly sour and delicate flavor. In Tuscany it is considered one of the most prized salad herbs, while in Romagna it is sometimes used cooked as filling for piadine.

The scapes (flowering stems) can be harvested and cooked like asparagus, often used to prepare omelets or other simple dishes. From a medicinal point of view, no particularly relevant therapeutic properties are recognized, although a mild soporific action is known if consumed in large quantities and an antacid effect for the stomach.

The plant is part of a group of species called "compass herbs" for the particular arrangement of the leaves, traditionally used as an indicator of orientation with respect to the sun.

Etymology

The scientific name derives from the Greek "chondros" meaning "seed" or "lump", referring to the secretion of latex that coagulates quickly on contact with air, typical of the plant. The epithet "juncea" refers to the appearance of the stem similar to that of rushes (Juncus spp.), i.e. thin, erect and cylindrical.

The Italian common name "lattugaccio" recalls the relationship with lettuce (Lactuca spp.) and the presence of white latex, while "comune" distinguishes this species from others with similar characteristics.

Sources

• Prof. S. Pignatti, "Flora d'Italia"
• Acta Plantarum - Flora delle regioni italiane (scheda di Antonino Messina)
• Tela Botanica / H. Coste, "Flore descriptive et illustrée de la France"
• World Flora Online (WFO)