Allamanda, also known as golden trumpet or common allamanda, is a tropical, evergreen, perennial vine in the dogbane family (Apocynaceae) characterized by large, showy, yellow or purple trumpet-shaped flowers and glossy green leaves, often used as an ornamental plant. 

Here's a more detailed description:

Key Characteristics:

Type: Evergreen, tropical, perennial vine or shrub.

Flowers: Large, trumpet-shaped, showy flowers, typically yellow or purple.

Leaves: Glossy, leathery, and green.

Growth Habit: Sprawling, climbing vine that needs support like a trellis or fence.

Native Range: Native to South America, specifically Brazil.

Uses: Commonly used as an ornamental plant in tropical and subtropical regions.

Other Names: Golden trumpet, common allamanda, purple allamanda 

Specific Species:

Allamanda cathartica (Yellow Allamanda): The most common species, known for its bright yellow flowers. 

Allamanda blanchetii (Purple Allamanda): Features purplish-pink to violet trumpet flowers. 

Allamanda schottii (Bush Allamanda): A shrubby species with large yellow flowers. 

Cultivation:

Sunlight: Requires full sun.

Water: Moderate watering.

Support: Needs a trellis or other support to climb.

Toxicity: All parts of the plant are considered toxic, containing a milky sap.