Oleander
(Nerium oleander)
Oleander
(Nerium oleander)
This is a shrub belonging to the Apocynaceae family that produces flowers throughout the year. The Oleander flower originates from North Africa, the eastern Mediterranean, and also Southeast Asia. The plant grows well in warm, dry regions and can be cultivated in various areas.
Grows well in lowlands up to mountains at an altitude of 1,600 meters above sea level (m.a.s.l.). Its growth prefers hot (tropical) climatic conditions at a temperature of 20–22 °C, with an average annual rainfall of 2,443 mm/year. It favors open areas with full sun exposure, sandy, rocky, loamy, and sandy clay soils with moderate to high moisture.
Root: Has root branches that help to expand the absorption area and strengthen the plant's upright stance.
Stem: Has sympodial branching, a smooth surface, and an erect (perpendicular) growth direction. The stems are upright and spread outwards as they mature, with a grayish, woody, round cross-section, smooth surface, branched, contains white-greenish sap (latex).
Leaves: Long green leaves, with a length of 5–21 cm and a width of 1–3.5 cm, with an entire (smooth) margin. The leaves consist only of the leaf blade (lamina) and petiole (leaf stalk), lacking a leaf sheath (vagina), hence called stalked leaves. The petiole is not very long, ranging from 0.5–1 cm.
Flower: Determinate compound inflorescence (cyme) because the tip of the main stalk is always terminated by a flower, limiting the main stalk's growth.
Seed: Hard, small, needle-shaped, ± 1 cm long, black color.
Propagation: Done generatively (seeds) and vegetatively (stem cuttings).
Another use for this poisonous plant is as a botanical insecticide. The parts used are the root, stem, bark, leaves, and flowers. However, the most common and frequently used part is the leaves because they contain the highest amount of oleandrin. The oleandrin substance acts as a stomach poison and a feeding inhibitor for larvae. The stomach poison affects the larva's metabolism after consumption. The toxin then enters the body and is digested in the midgut, after which it is circulated with the body fluid (hemolymph). The carried toxin affects the larva's nervous system and subsequently causes death.
Triterpenes, cardiac glycosides, oleanderol, caneronic acid, and canerin.
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