What are the morphological characteristics of oleander?
Evergreen shrub or small tree. Plant height 1.5-6 m, upright growth habit. Stems smooth, strongly branching; old branches grayish-brown, new branches purplish-brown or green. Leaves simple, whorled or opposite, lanceolate, 10-25 cm long, leathery, entire margins, midrib prominent; a small amount of white milky sap present in both branches and leaves. Cymes terminal; corolla funnel-shaped, 5-lobed, flower diameter 3-5 cm, in colors such as pink, deep red, red, and white. Single or double flowers, with a distinctive fragrance. Flowering period June-October. Follicle, elongated horn-shaped. Fruit ripening period December
Evergreen shrub or small tree. Plant height 1.5-6 m, upright growth habit. Stems smooth, strongly branching; old branches grayish-brown, new branches purplish-brown or green. Leaves simple, whorled or opposite, lanceolate, 10-25 cm long, leathery, entire margins, midrib prominent; a small amount of white milky sap present in both branches and leaves. Cymes terminal; corolla funnel-shaped, 5-lobed, flower diameter 3-5 cm, in colors such as pink, deep red, red, and white. Single or double flowers, with a distinctive fragrance. Flowering period June-October. Follicle, elongated horn-shaped. Fruit ripening period December to January of the following year.