Bunga Dedap

A. Taxonomical Info

Domain: Eukarya

Kingdom: Plantae

Phylum: Spermatophyta

Class: Dicotyledonae

Order: Fabales

Family: Fabaceae

Genus: Erythrina

Species: Erythrina variegata L.

B. Morphological / Distribution / Habitat Info

Morphology
Erythrina variegata is a medium to large deciduous tree that can reach up to 30 meters in height in natural settings. A key morphological feature is its thick, sappy trunk and branches often covered with scattered, large prickles . .The leaves are compound and trifoliate, meaning each leaf is divided into three diamond-shaped or ovate leaflets. (CABI Compendium, 2022). The most striking feature is its scarlet or crimson red flowers produced in dense clusters (racemes). Critically, the tree typically flowers during the dry season before the new leaves appear, making the flowering display particularly spectacular (Kumar et al., 2010). 

Distribution
It is considered native throughout a vast area spanning East Africa, the Indian Ocean Islands, the Indian Subcontinent, Southeast Asia (including Malaysia), and extending eastward into the Western Pacific Islands such as Fiji and Polynesia (CABI Compendium, 2022). Due to its attractive flowers and functional uses like providing shade and improving soil, it has been widely cultivated in other tropical regions globally, including Central and South America, used both as an ornamental tree and a shade tree in agroforestry systems (Winrock International, n.d.). 

Habitat Info
Erythrina variegata naturally thrives in coastal regions, along riverbanks, and in open areas. It requires full sunlight and prefers well-drained soil to grow optimally (NParks, 2025). The tree is highly valued for its significant tolerance to harsh environmental conditions, especially those found near the sea. This includes a strong resistance to salt spray and high winds, making it an excellent choice for coastal planting and stabilization. In natural ecosystems, it is frequently found at the edges of mangrove forests and within littoral rainforests directly behind the beach zone (Flora of Australia, 2024).

C. Traditional Uses / TK-related Info

▪Medicinal use 

The leaves are the most commonly utilized part. Decoctions made from the leaves are widely used to treat illnesses involving inflammation and pain, including fever, general inflammation, and coughs (Kumar et al., 2010). The primary bioactive compounds are alkaloids, such as erythromycin, which have demonstrated anti-inflammatory and analgesic properties for pain relief in studies. Additionally, crushed leaves are often topically applied to areas experiencing swelling or rheumatic pain.

▪ Sedative and pain relief 

In traditional practice, warmed leaves are used as a forehead compress to ease headaches, induce a state of calmness, or alleviate sleeplessness. The alkaloids present in the bark and leaves are known to act as depressants on the central nervous system (CNS). These compounds lend support to the reported sedative effects, justifying their traditional use for neuropathic pain relief and tension management.

▪Cultural and ornamental 

Bunga Dedap is highly prized for its aesthetic value. Its bright red flowers, which appear dramatically before the foliage, are often associated with beauty, passion, and vitality in Malay literature and poetry. As an ornamental tree, Dedap is widely planted in urban settings. It is a popular shade tree along roadsides, in home gardens, and in public parks because it is fast-growing and provides a wide canopy.

▪ Agricultural use 

The tree is an efficient nitrogen-fixer, meaning it possesses root nodules that convert atmospheric nitrogen into a form usable by other plants. This process naturally enriches soil fertility. Due to these traits and its rapid growth, Erythrina variegata is a primary component in tropical agroforestry systems. 

D. Any related scientific studies, such as ecology/ conservation status/threats/diversity

Modern studies have found that Erythrina variegata contains flavonoids, alkaloids, and triterpenes with anti-inflammatory and antioxidant activities. Research indicates that its extracts show potential for liver protection and antimicrobial effects. Ecologically, the tree provides nectar for birds and insects, improving biodiversity. It is not considered threatened and is classified as Least Concern on the IUCN Red List.