Task: Explanation
Input (English): The Hawaiian tropical dry forests are a tropical dry broadleaf forest ecoregion in the Hawaiian Islands. They cover an area of 6600 km2 on the leeward side of the main islands and the summits of Niʻ ihau and Kahoʻ olawe. These forests are either seasonal or sclerophyllous. Annual rainfall is less than 127 cm and may be as low as 25 cm ; the rainy season lasts from November to March. Dominant tree species include koa ("Acacia koa"), koaiʻ a ("A. koaia"), ʻ akoko ("Euphorbia" spp.), ʻ ōhiʻ a lehua ("Metrosideros polymorpha"), lonomea ("Sapindus oahuensis"), māmane ("Sophora chrysophylla"), loulu ("Pritchardia" spp.), lama ("Diospyros sandwicensis"), olopua ("Nestegis sandwicensis"), wiliwili ("Erythrina sandwicensis"), and ʻ iliahi ("Santalum" spp.). Endemic plant species in the dry forests include hau heleʻ ula ("Kokia cookei"), uhiuhi ("Caesalpinia kavaiensis"), and "Gouania" spp. The palila ("Loxioides bailleui"), a Hawaiian honeycreeper, is restricted to this type of habitat. Question: Hawaiian tropical dry forests have a dominant tree species of which tree in the pea family? Answer: Acacia koa
Output (English):  Dominant tree species include koa Acacia koa, koaiʻ a A. koaia, ʻ akoko Euphorbia spp.