^ In the grass family, ok but :
Bamboo is a viable replacement for wood. It is one of the strongest building materials, with a tensile strength that rivals steel and weight-to-strength ratio surpassing that of graphite. It withstands up to 52,000 pounds of pressure psi. With a 10-30% annual increase in biomass versus 2-5% for trees, bamboo creates greater yields of raw material for use. One bamboo clump can produce 200 poles in the five years it takes one tree to reach maturity.
This is taken from one site promoting the houses they make with this material...
Wiki puts it in grass, but remains some very interesting material...