INTRODCUTION

Grasses and Climbers are the most important groups of Angiosperms. Both belong to different divisions, families and orders. The grass family Poaceae, formerly called Gramineae belongs to division monocotyledon and order Poales is one of the largest plant families, comprising about 700 genera and 10,000 species (Macfarlane). Grasses are the most versatile plant life-forms on the earth. They are evenly distributed in all parts of the world and occupy a wide range of latitudes, altitudes and habitats, from wet and dry tropical to arctic.  This family ranks at fifth place, the first four places being occupied respectively by Compositae, Leguminosae, Orchidaceae and Rubiaceae. They germinate in every type of soil and under all climatic conditions. In certain places grasses form a leading feature of the flora. Grasses do not like shade; they are not usually abundant within the forests either as regards the number of individuals, or of species. But in open places they do very well and sometimes whole tracts become grass-lands. The Poaceae are the world’s single most important source of food. They are important ecologically frequent components of vegetation, dominating in grasslands and savannas, as well as providing food for grazing animals. Grasses are also of great economic importance, comprising the three most important food crops, wheat, rice and maize (corn), as well as several of the other top 20 food crops. They also contribute other products, including fodder, fiber and construction materials (from bamboos). Plant communities dominated by grasses account for about 24 percent of the Earth’s vegetation. On the other hand Climber plants not widely distributed they use other plants or rocks and manmade structures for support. There are 90 genera, 700 species, mainly belongs to tropical and subtropical regions. They belong to class Dicotyledons. Climbers are mainly distributed in the tropics and subtropics, in temperate regions often found in cultivation. Released from the function of holding up the plant shoots, the stems possess little or no ability to bear any weight (compression), but instead they are very flexible and have considerable tensile strength, meaning that stems have evolved characteristics to resist pulling and twisting. These two groups are very complex in their structure and less is known about them but both are economically important for humans.