Trees & Shrubs

of the ETS de Ingenieros Agrónomos
and EU de Ingeniería Técnica Agrícola of Madrid

Trees and Shrubs of the ETS de Ingenieros Agrnomos and EU de Ingeniera Tcnica Agrcola of Madrid

Species Sheets

Nerium oleander L. Sound tool

oleander, rose bay

SHEET

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  • Contextual Icon: HermaphroditeEsp. Hermaphrodite
  • Contextual Icon: ToxicToxic Species

Species information

Description

Habit: evergreen shrub 2-4 m tall, densely branched from its base.

Leaves: opposite or in whorls of 3, persistent, simple, with short petioles; blade 15-30 cm long x 2-4 cm wide, elliptic or lanceolate, with an acute apex, a cuneate base and entire margins, somewhat stiff and leathery.

Flowers: hermaphrodite, apparently subactinomorphic (or almost symmetrical due to the curvature of the petals), 3-5 cm in diam., in different colours, sometimes double, hypogynous, arranged in terminal corymbiform cymes; calyx gamosepalous; corolla gamopetalous, formed by 5 white, yellowish, pink or purple petals fused into an infundibular tube with a crown of elongate dentate appendices at its opening and prolonged into 5 perpendicular lobes arranged radially, 5 stamens with the base of their filaments fused to the internal side of the corolla tube; gynoecium apocarpous, 2-carpellate, with pistils and a superior ovary.

Fruit: erect double follicle formed by 2 fruitlets (follicles) 8-16 cm long that open releasing numerous seeds with abundant apical hairs.

Fenology

It flowers throughout the summer; fruits mature in winter.

Geographical origin

Native to the Mediterranean region.

Observations

It is often cultivated as an ornamental because of its evergreen foliage, its showy flowers in summer and its drought hardiness, although it is a very toxic plant due to the cardiotonic glycosides (oleandrine) it contains.

The individuals next to the staircase that communicates the parking lots of both schools are seriously affected by Pseudomonas syringae subsp. savastanoi, a bacterium that causes tumours on twigs and leaves as well as flower abortion (see Picture Gallery). This bacterium causes olive knot in olive trees.

It is easily propagated from greenwood or semi-hardwood cuttings or seeds.

IMAGES

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Nerium oleander: Branch with showy flowers arranged in corymbiform cymes; at the centre of each flower, the deeply-lobed corolla has a fringe around the central corolla tube

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Species location

 
Ahora: 1406586612.91 Despues : 1406586612.91 Total = 0.00223112106323