Grasses

Grasses are part of the Poaceae family.  Grasses have round, hollow or pithy stems which are called culms along with alternately growing leaves from two sides of this main stem which are narrow with parallel veins.

It is estimated that there are around 10,000 species of grasses which cover approximately 20% of the vegetation cover on the earth's surface. They range from a variety of annuals with differing habits ie small, erect, twisted or creeping etc. to perennial plants. Grasses are perhaps the most important species on earth to man due to grain production of staple foods. Bamboo (also part of the grass family) is also a very important source of building material in Asia. 

Annuals 
Biennials
Perennials
Shrubs 
Trees