棉花花朵的五瓣花瓣,呈覆瓦状互相重叠,从上往下看表现旋向。此种旋向及其在棉株上的分布具有一定规律: 一、棉花花瓣的旋向(指花瓣外缘的出向。见图),有顺时针和反时针两种。二、任何一朵花的旋向与所在节位叶片着生方向有关。如人在果枝基部面向果枝尖部,左手示果枝左侧,右手示果枝右侧,则叶片在果枝左侧,花朵旋向为顺时针;叶片在果枝右侧,花朵旋向为反时针(见图)。 Five petals of cotton flower petals, were imbricate overlapping, from the top to show the performance of rotation. This rotation and its distribution in the cotton has a certain law: First, the petals of cotton rotation (referring to the petal edge of the outbound. See Figure), there are two kinds of clockwise and anti-clockwise. Second, the whirl of any one flower and leaves the festival where the direction of the students. Such as people in the fruiting branch of the branches facing the tip of fruiting branches, the left hand shows fruiting branches on the left, the right hand shows fruiting branches on the right, the leaves in the fruit branch on the left, the rotation of flowers clockwise; leaves on the right fruit branch, flower rotation counterclockwise Figure).