Botanical Overview
Formosa Koa (Acacia confusa) is a species in the Fabaceae family. The legume family (Fabaceae) includes trees, shrubs, and herbs that produce pods (legumes) and form nitrogen-fixing root nodules through symbiosis with bacteria. The flowers are typically pea-shaped with five petals. This large family provides food staples, timber, and numerous medicinal species. Phytochemical data for this species are limited at present.
General Description
Some common names for it are ayangile, small Philippine acacia, Formosa acacia (Taiwan acacia), Philippine Wattle, and Formosan koa. It grows to a height of 15 m. The tree has become very common in many tropical Pacific areas, including Hawaii, where the species is considered invasive.
Family Context
The Fabaceae family is large and globally distributed. Notable medicinal members include:
- Soybean — 76 documented uses
- Crab’s Eye — 73 documented uses
- Tamarind — 59 documented uses
- Common Indigo — 51 documented uses
Geographic Distribution
Formosa Koa has been recorded in 10 countries and territories worldwide, including China, Hong Kong, Japan, Macao, Northern Mariana Islands, and others.
Active Compounds
Phytochemical research has identified 3 compounds in this species: myricetin-3-o-(2’’,2’’-di-o-galloyl)-alpha-rhamnopyranoside, myricetin-3-o-(2’’-o-galloyl)-alpha-rhamnopyranoside-7-methyl-ether, myricetin-3-o-(3’’-o-galloyl)-alpha-rhamnopyranoside-7-methyl-ether.
The identified compounds include the following categories:
- Flavonoid: antioxidant compounds that protect cells from oxidative damage
- Tannin: astringent compounds that tighten tissues and resist infection
Research Status
Although this species has documented phytochemical constituents, its ethnobotanical and clinical documentation remains incomplete. The limited documentation available for this species represents an opportunity for ethnobotanical research.