Pinus belong to order coniferales of Gymnosperms. The plant is differentiated into root, stem and leaves. Plants are monoecious. Both male and female cones are borne on the same plant. It develops clusters of shortly stalked male cones subterminally on the lower branches and female cones in circle of 2 - 6 on upper long branches. A male cone has a central axis and a number of spirally arranged microsporophylls. A microsporophyll bears two oblong microsporangia abaxially on the proximal part. The terminal flattened part is bent and sterile. A microsporangium produces a large number of yellow pollen grains. Each pollen grain has two wings or air sacs for floating in the air. The central axis of female cone bears paired scales. In each pair the lower scale is bract scale while the upper one is ovuliferous scale (= megasporophyll complex), the terminal sterile part of ovuliferous scale is broad and called apophysis. The proximal adaxial side bears two ovules.