Translations:Adventist Youth Honors Answer Book/Nature/Wattles/8/en
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3. How are acacias classified into two major groups?
Acacia leaves come in two major forms: bipinnate, and phyllodes.
Acacia seyal, showing bipinnate leaves
Acacia leprosa, showing phyllodes
Acacia koa showing both phyllodes and bipinnate foliage
Pinnate leaves are compound, consisting of leaflets. The word pinnate comes from the Latin word pinna for "feather". In fact, the word pen shares this origin, as the first ink pens were made from feathers. In bipinnnate leaves, the leaflets have leaflets of their own, as in the top image to the right.
