Wikstroemia oahuensis

In the wild, ʻākia can grow to 5 feet (1.5 m) tall, but in cultivation it usually reaches 3 feet (0.91 m) with a diameter of 10 feet (3.0 m). The young branches are gray, yellow, or reddish brown. The leaves grow with two leaves opposite each other on the branch, overlapping, and are dark green or grayish on the upper surface and lighter green underneath. They are oval to round and usually under 1 inch (2.5 cm) long. This species is highly variable, with the leaves ranging from large and long to small and round. The stems do not snap but peel when bent. It flowers irregularly throughout the year, but produces fewer flowers when the plant has mature fruit. The tubular yellow to yellow-green flowers may be perfect (bisexual) or unisexual (either male or female), and less than 0.5 inches (1.3 cm) long. The dwarf bog form from Kauaʻi is sometimes recognized as a separate species, W. palustris.

There are 12 Wikstroemia species endemic to the Hawaiian Islands. Wikstroemia oahuensis is a relatively common plant in a wide variety of habitats on the islands of Kauaʻi, Oʻahu, Molokaʻi, Lānaʻi, and Maui. It inhabits ridges and rocky areas, hala (Pandanus tectorius) forest, mesic forest, wet forest, and bogs at elevations of 100-1,400 metres (330-4,590 ft).

The bacteria species Flavobacterium akiainvivens was originally isolated from rotting ʻākia wood, and the shrub lends it its name.

Toxicity

Native Hawaiians used this species to stupefy fish. A poison made from ʻākia, in combination with other plants, was used to execute criminals.

Medicinal

Hawaiian medicinal uses are as a laxative and for treatment of asthma. Possible anti-tumor activity.

Other

ʻĀkia is used in Hawaiʻi as landscape specimen. Seeds and flowers are used to make beautiful lei.