How strong is the adaptability of the yellow allamanda? You will understand after reading this.
Other names for the yellow allamanda
The yellow allamanda, an upright shrub plant, is also called yellow oleander allamanda.
Origin of the yellow allamanda
This variety is native to Brazil and is now widely cultivated in tropical regions. It is cultivated in gardens in Guangxi, Guangdong, Fujian, Taiwan, China, and Beijing (in greenhouses) in China.
Morphological characteristics of the yellow allamanda
The yellow allamanda is about 1-2 m tall, has milky sap, and its branches are grayish-white.
The leaves are whorled in groups of 3-5, entire, mostly elliptical or obovate-oblong, about 6-12 cm long and about 2-4 cm wide. The leaf tip is acuminate or acute, the base is cuneate, the upper surface of the leaf is dark green, and the underside is light green. Except for the hairs on the midvein and lateral veins on the underside, the rest is hairless.
The veins are flat on the upper leaf surface and raised on the underside. There are 7-12 lateral veins on each side, which anastomose before reaching the margin; the petiole is very short, and glands are present at the base and in the axils.
The cyme of the yellow allamanda is terminal, the pedicel is hairy, the flowers are yellow, 4-6 cm long, with an opening diameter of about 4 cm, and the bracts are lanceolate, borne at the base of the pedicel.
The corolla is funnel-shaped, with reddish-brown stripes inside. The lower part of the corolla is cylindrical, no more than 2 cm long, 2-4 mm in diameter, swollen at the base. The throat extends upward into the limb, about 3 cm long and about 1.5 cm in diameter. The apex of the limb is 5-lobed, the corolla lobes overlap to the left, the lobes are ovate or circular, obtuse at the apex, 1.6-2.0 cm long and about 1.7 cm wide.
The yellow allamanda has 5 stamens, growing in the throat of the corolla tube. The filaments are relatively short, hairy at the base, the anthers are ovate, rather blunt at the apex, the disk is fleshy and entire, the ovary is entire, 1-loculed, the style is filiform, the stigma is obtuse at the apex, and ring-shaped at the base.
The capsule of the yellow allamanda is spherical, with long spines, about 3 cm in diameter. The seeds are flat, with a membranous margin, about 2 cm long and about 1.5 cm wide. The flowering period is from May to August, and the fruiting period is from October to December.