Brazilian Rain Tree
Brazilian Rain Tree, also known as Pithecellobium tortum, is a tropical native of Central and South America. The deep green foliage of this legume is compound, with tiny little leaflets. The leaves fold up at night, or when it appears dark during the day due to cloud coverage; they will sometimes even close up when it is simply too hot.
The trunk is fluted and exfoliating, with the brown bark peeling off in strips to reveal a light, smooth finish, resulting in a striking contrast between the two. The branches are home to very long, sharp thorns. The blooms are puffy white balls that turn yellowish with time. There may not be much flowering on a bonsai version of this plant due to the frequent pruning needed to maintain its size.