Acacia koaia Acacia koaia Acacia koaia, known as koaia or koaie in Hawaiian, is a tree in the pea family, Fabaceae, that is endemic to Hawaii. It is closely related to "koa" ("A. koa"), and is sometimes considered to be the same species. "Acacia koaia" is usually distinguished by growing as a short (rarely more than ), broad, gnarled tree; having the seeds longitudinally arranged in the pod; shorter, straighter phyllodes; and much denser wood. A population on the northern coast of Kauai may be intermediate, but the relationships have not been worked out. "Koaia" wood is claimed to be very different
Metrosideros polymorpha the most common native tree in the Hawaiian Islands, tolerating a wide range of soil conditions, temperature, and rainfall. It grows from sea level right up to the tree line at elevations of and is commonly found in moist and dry forests, high shrublands, and is a colonizer of recent lava flows. It is relatively slow growing. Dominant in cloud forests above , the tree is also common in seasonally wet forests, where it may be dominant or form mixtures with the native "Acacia koa". "Metrosideros polymorpha" may occur as a tall tree or a prostrate shrub, and everything in