Br. Allamand (18th century). The genus includes temperate-warm, evergreen, sarmentose plants of tropical America, with verticillated leaves and very funnel-shaped, funnel-shaped flowers.
Cultivated species of Allamanda:
Allamanda cathartica, the most vigorous, can rise to three meters in height; It has yellow flowers at the beginning of the summer. It has many var. among which grandiflora, with pale-yellow flowers of about 10 cm; hendersonii with yellow flowers spotted in white and shaded in brown outside; nobilis, one of the most widespread, with yellow and fragrant flowers; neerifolia, semi-sarmentosa of about 1.50 m high, with yellow and orange striated flowers; violacea, which has pink-violet flowers in autumn, is sarmentosa but weak and therefore is often grafted onto cathartica.
the A. prefer a soft and permeable soil, with a prevalence of heather or heath land, and an efficient drainage. They want bright light, sunny location, frequent summer waterings and reduced winter; it is good to trim new side shoots; the minimum winter temperature must be 13 ° C. It is multiplied by cuttings, at the end of the winter, in the greenhouse, with the underlying heat and the latex spills out of the wound. The compound used for cuttings will be similar to that of the adult plants.
Also read: Alisma (Alismataceae).