Cynanchica pyrenaica

Morphological description

Cynanchica is a perennial plant belonging to the Rubiaceae family, characterized by a tufted habit and a height ranging from 8.5 to 43, sometimes 65 cm. The plant has a woody root at the base and features a creeping or arcuate-ascending stem, which can be glabrous, papillose, or covered with puberulent hairs on the lower and middle internodes, as long as the leaves; the upper internodes are glabrous instead.

The leaves are arranged in whorls of 4-6 elements, sessile and opposite, with an erect habit. Their shape varies from linear to lanceolate-linear, elliptical, or oblanceolate, with thickened or revolute margins. The lower leaves measure from 1.1 to 8 mm in length and from 0.5 to 2 mm in width, while the median and upper leaves are larger, from 5 to 26 (up to 31) mm in length and from 0.5 to 2.1 mm in width. The upper leaves have a median nerve less than three-quarters of their width and can be glabrous or papillose.

The inflorescence is corymbose, few-flowered, and subsessile, with a diameter ranging from 2 to 15, sometimes up to 23 cm, composed of divaricate branches ending in dichasial cymes containing 2-4 flowers on peduncles about as long as the axillary leaves. The bracts, arranged in whorls of 4 (two large and two short), are lanceolate-ovate or linear, 1.3 to 6.5 (up to 9) mm long and 0.4 to 1.2 mm wide, generally free or weakly connate; the bracteoles, longer than the pedicels, measure from 0.5 to 2.7 mm in length and from 0.1 to 1.4 mm in width.

The flowers, almost always tetramerous and subsessile, have a funnel-shaped-obconic corolla of pinkish-white color, sometimes with external pubescence or rarely scabrous, with a diameter between 2 and 4.5 (up to 5.2) mm and a corolla tube length from 1.3 to 2.9 mm. There are four stamens with filaments about 0.3 mm long, inserted into the corolla tube, and violet anthers longer than the filament.

The fruit is an ovoid or ellipsoid achene, covered with thin darker-colored papillae.

Habitat and distribution

Cynanchica is a eurymediterranean species, with a range centered on the Mediterranean coasts and extending north and east, including the area of Vite. In Italy, it is mainly found in arid environments and calcareous pastures, as well as on screes, from the plain level up to about 1000 meters above sea level, with rare occurrences up to 2000 meters.

It therefore prefers calcareous, dry, and well-drained soils, often in sunny exposures typical of Mediterranean and submontane habitats.

Flowering period

Flowering extends from June to October, with possible local variations related to altitude and specific climatic conditions of the site.

Ecology and pollination

The plant is characterized by a scapose habit, with an elongated floral axis often leafless, typical of scapose hemicryptophytes. The tetramerous flowers, small in size and pinkish-white in color, are probably pollinated by pollinating insects attracted by the funnel-shaped corolla and the bright color, although specific data on pollinating insects are not detailed in the sources.

Seed dispersal occurs through achenes equipped with papillae, which can facilitate adhesion to substrates or animals, contributing to the spread of the species in suitable environments.

Curiosities and traditional uses

The genus Cynanchica owes its name to ancient medical tradition: it derives from the Greek συνάγχη (synanche), a term indicating an acute throat inflammation with suffocation, known as cynanche or quinsy, suggesting a traditional use of the plant as a remedy for these ailments. The etymology may reflect the plant’s attributed ability to treat such disorders, although historical pharmaceutical applications are to be considered informative and not a substitute for medical treatment.

In floriculture, Cynanchica is appreciated for its erect-prostrate appearance, making it suitable for forming excellent ground covers for alpine and rock gardens; several cultivated varieties of this species have also been obtained.

Etymology

The scientific name "Cynanchica" derives from ancient Greek, where συνάγχη (synanche) means “to strangle together” or “to suffocate,” referring to the ancient throat disease known as cynanche or quinsy. Some scholars trace the term to συν (with) and ἄγχω (to strangle), while others connect it to κύων (dog), probably referring to canine cough.

The Italian common name "stellina comune" probably refers to the shape and corymbose arrangement of the flowers which, small and delicate, resemble a little star.

Sources

• Acta Plantarum - Flora delle regioni italiane (actaplantarum.org)
• Acta Plantarum - Flora delle regioni italiane (scheda di Antonino Messina)