bio.wikisort.org - Plant

Rhamnus alaternus is a species of flowering plant in the buckthorn family Rhamnaceae, known by the common names Italian buckthorn or Mediterranean buckthorn. It is a hardy medium-sized evergreen shrub with fragrant flowers.

Mediterranean buckthorn
Flowering and fruiting sprigs with foliage
Conservation status
Least Concern  (IUCN 3.1)[1]
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Rosids
Order:	Rosales
Family:	Rhamnaceae
Genus:	Rhamnus
Species:	R. alaternus
Binomial name
Rhamnus alaternus L.
Synonyms
Rhamnus clusii Willd. Rhamnus myrtifolia Willk.

Etymology

The specific Latin name alaternus, is from the Latin word for the plant. Its origin is obscure but is often suggested to be of Etruscan or pre-Indo-European Mediterranean origin.[2]

Description

Rhamnus alaternus is an evergreen shrub 1–5 metres (3 ft 3 in – 16 ft 5 in) high.[3] The stems have reddish bark and pubescent young branches, rounded and compact foliage with alternating leaves, 2–6 centimetres (0.79–2.36 in) long,[3] sometimes nearly opposite, oval or lanceolate, leathery, shiny green, yellowish-green underneath.

The small fragrant flowers are gathered in a short axillary yellow-green raceme. The flowering period extends from February to April. Fruits are obovoidal red-brownish drupes of about 3–4 millimetres (0.12–0.16 in),[3] containing from 2 to 4 seeds. The drupes darken to black when ripe.

Distribution and habitat

This species is widespread in thermophilic evergreen bush and scrubland of the Mediterranean climate regions, from Gran Canaria, Morocco and Portugal in the west, to the Levant in the east, from sea level up to 1,300 m (4,300 ft) altitude.[3][4]

Invasiveness

In Australia, where it was introduced as a garden shrub, it has become a serious invasive woody weed in many areas, especially coastal parts of SE Australia. Here it displaces native shrubs of similar size such as the sea box, Alyxia buxifolia (an endemic plant which had an important medicinal role for aboriginal people). It prevents subshrubs and herbaceous ground cover native plants from surviving due the heavy shade and competition for moisture and nutrients. It can form dense thickets with very low biodiversity.[5]

Cultivation

This species is cultivated as an ornamental garden shrub, valued for its glossy evergreen leaves and red berries. The variegated cultivar 'Argenteovariegata'[6] has gained the Royal Horticultural Society's Award of Garden Merit.[7]

Subspecies

• Rhamnus alaternus subsp. alaternus
• Rhamnus alaternus subsp. myrtifolia (Willk.) Maire
• Rhamnus alaternus subsp. pendula (Pamp.) Jafri

Gallery

• 
  Habit in Mallorca
• 
  Habit in France
• 
  Male flowers, South Africa
• 
  Foliage and fruit, Italy

References

• Pignatti S. - Flora d'Italia - Edagricole – 1982 Vol. II, pg. 78
• Plants.USDA
• Biolib

External links

• Acta Plantarum
• Schede di Botanica

На других языках

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- [en] Rhamnus alaternus

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[es] Rhamnus alaternus

Rhamnus alaternus conocido popularmente como aladierna,[1] aladierno[2] o alaterno, es un pequeño árbol perenne y dioico de la familia de las ramnáceas característico de la región del Mediterráneo.

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[ru] Жостер вечнозелёный

Жо́стер вечнозелёный (лат. Rhamnus alaternus) — кустарник; вид рода Жостер (Rhamnus) семейства Крушиновые (Rhamnaceae).

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