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Each "thumbnail" image below is linked to a larger photograph.
| Acacia koa, koa, koai'a, koai'e, koa'oha, endemic. Saplings exhibit a transition from the production of juvenile bipinnately compound leaves to highly modified structures called phyllodes that are more efficient in water utilization. | |
| Acacia koaia, koa, koai'a, koai'e, koa'oha, endemic, 1,2 - Kaua'i, 3,4 - Kohala, Hawai'i. |